🕷️ Crawler Inspector

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Raw Queries and Responses

1. Shard Calculation

Query:

Response:

Calculated Shard: 92 (from laksa141)

2. Crawled Status Check

Query:

curl -X POST \
  'http://laksa092.int.ahrefs:8124/' \
  -H 'Content-Type: text/plain' \
  -H 'X-ClickHouse-Database: crawler3' \
  -H 'Authorization: Basic YXBpOg==' \
  -d 'SELECT getAhrefsURLFromUnparsed(src_unparsed) AS found_url, ifNull(toUnixTimestamp(download_stamp), 0) AS crawl_time, ifNull(toUnixTimestamp(props_url_first_seen), 0) AS first_indexed_time, download_http_code AS http_code, src_unparsed AS src_unparsed, src_root_hash AS src_root_hash, history_drop_reason AS history_drop_reason, meta_title AS meta_title, meta_descriptions AS meta_descriptions, attrs_boilerpipe_text AS attrs_boilerpipe_text, attrs_markdown AS attrs_markdown, attrs_readable_markdown AS attrs_readable_markdown, meta_canonical AS meta_canonical FROM crawler3.page_info_local FINAL PREWHERE (src_root_hash, src_unparsed) IN ((getAhrefsRootHashFromUnparsed(getAhrefsUnparsedNoserviceFromURL(\'https://www.wikihow.com/Solve-a-Sudoku\')), getAhrefsUnparsedNoserviceFromURL(\'https://www.wikihow.com/Solve-a-Sudoku\'))) FORMAT JSONEachRow'

Response:

{"found_url":"https:\/\/www.wikihow.com\/Solve-a-Sudoku","crawl_time":1776423464,"first_indexed_time":1507196071,"http_code":200,"src_unparsed":"com,wikihow!www,\/Solve-a-Sudoku s443","src_root_hash":"12431216878206919092","history_drop_reason":null,"meta_title":"How to Solve a Sudoku: Easy Tips & Tricks for Beginners","meta_descriptions":["Try these simple strategies to improve your sudoku skills Sudoku puzzles may seem intimidating at first, but with a bit of practice, they're pretty easy to solve. These puzzles don't actually involve math (thankfully). Instead, they're all..."],"attrs_boilerpipe_text":"Download Article\nTry these simple strategies to improve your sudoku skills\nDownload Article\nSudoku Rules & Layout\n|\nUsing the Scanning Strategy\n|\nFilling in Candidates\n|\nFixing Mistakes\n|\nDoes sudoku involve math?\n|\nVideo\n|\nQ&A\nSudoku puzzles may seem intimidating at first, but with a bit of practice, they’re pretty easy to solve. These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles.\nSolving a Sudoku: Quick Tips\nStart by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row.\nA sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled.\n[1]\nThe larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern.\nEach row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle.\n[2]\nFor example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square.\nSimilarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block.\nIt’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better.\nAdvertisement\nExamine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9.\n[3]\nFor example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in.\nOr, if a column has numbers 1-7 and 9, you know it’s missing the number “8.”\nThis is one of the easiest strategies to use, especially when just starting the puzzle.\nLook at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning.\n[4]\nFor example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block.\nOnce you get the hang of scanning across just rows or columns, add the other direction as well.\nThat is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat.\n[5]\nAnother option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number \"6.\" See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can.\nAdvertisement\nA candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in.\n[6]\nA naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row.\n[7]\nFor example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked.\nHidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers.\n[8]\nFor example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block.\nAn X-wing is an advanced technique used to remove candidates in\ndifficult puzzles\n. First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the\ncolumns\nthat contain those cells.\n[9]\nFor example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row.\nAdvertisement\nIf you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make.\n[10]\nIf you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle.\nRecheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before.\nIt’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch.\n[11]\nIf you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier.\nSudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you\nget stuck\n, don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help!\n[12]\n[13]\nAdvertisement\nWhile patterns are\ntechnically\na part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way.\n[14]\nSample Sudoku Puzzles\nBlank Sudoku Template\nSearch\nAdd New Question\nQuestion\nAre all sudoku puzzles solvable?\nCommunity Answer\nYes, unless the puzzle was printed with an error, which is unlikely.\nQuestion\nWhen all of the squares are the correct numbers, can I assume the rows and columns are correct?\nCommunity Answer\nThe numbers in the 9 squares cannot be \"correct,\" as you say, unless the rows and columns are also correct.  You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct.\nQuestion\nIs there an easy way to play sudoku?\nEllie\nCommunity Answer\nOnce you get the hang of it, it will become pretty easy and fun.\nSee more answers\nAsk a Question\n200 characters left\nInclude your email address to get a message when this question is answered.\nSubmit\nAdvertisement\nIt may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles!\nThanks\nThanks for submitting a tip for review!\nAdvertisement\nFor every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle.\nThanks\nAdvertisement\nReferences\nAbout This Article\nArticle Summary\nX\nSudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game!\nTo learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on!\nDid this summary help you?\nThanks to all authors for creating a page that has been read 2,736,252 times.\nReader Success Stories\nJanet Clark\nJun 25, 2018\n\"My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. 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Learn why people **trust wikiHow**](https:\/\/www.wikihow.com\/wikiHow:Delivering-a-Trustworthy-Experience)\n\n- [Categories](https:\/\/www.wikihow.com\/Special:CategoryListing \"Special:CategoryListing\")\n- [Hobbies and Crafts](https:\/\/www.wikihow.com\/Category:Hobbies-and-Crafts \"Category:Hobbies and Crafts\")\n- [Games](https:\/\/www.wikihow.com\/Category:Games \"Category:Games\")\n- [Puzzles and Memory Games](https:\/\/www.wikihow.com\/Category:Puzzles-and-Memory-Games \"Category:Puzzles and Memory Games\")\n- [Mathematical Puzzles](https:\/\/www.wikihow.com\/Category:Mathematical-Puzzles \"Category:Mathematical Puzzles\")\n# [How to Play Sudoku & Solve Any Puzzle: Beginner & Advanced Tips](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\nTry these simple strategies to improve your sudoku skills\n\n**Co-authored by** [Juliana Pache](https:\/\/www.wikihow.com\/Author\/Juliana-Pache)  and [Raven Minyard, BA](https:\/\/www.wikihow.com\/Author\/Raven-Minyard-BA)\n\n[Last Updated: February 19, 2026](https:\/\/www.wikihow.com\/Solve-a-Sudoku)  [Fact Checked](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n- [Sudoku Rules & Layout](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Sudoku-Rules-.26-Layout)\n- [Using the Scanning Strategy](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Using-the-Scanning-Strategy)\n- [Filling in Candidates](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Filling-in-Candidates)\n- [Fixing Mistakes](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Fixing-Mistakes-.26-Getting-Unstuck)\n- [Does sudoku involve math?](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Does-sudoku-involve-math.3F)\n- [Video](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Video)\n- [Q\\&A](https:\/\/www.wikihow.com\/Solve-a-Sudoku#qa_headline)\n\n\\|Show more\n\n\\|Show less\n\n[ARTICLE](https:\/\/www.wikihow.com\/Solve-a-Sudoku#steps_1)\n\n[VIDEO](https:\/\/www.wikihow.com\/Solve-a-Sudoku#Video)\n\nX\n\nThis article was co-authored by [Juliana Pache](https:\/\/www.wikihow.com\/Author\/Juliana-Pache) and by wikiHow staff writer, [Raven Minyard, BA](https:\/\/www.wikihow.com\/Author\/Raven-Minyard-BA). Juliana Pache is a puzzle maker based in Brooklyn, NY. Juliana is passionate about Black diasporic legacies and creates puzzles that engage with Black popular culture. She founded Black Crossword, the premier destination for word gamers interested in Black culture and the diaspora. Black Crossword launched in 2023 and offers a free daily mini puzzle, with plans to launch standard-size puzzles under a subscription. There is also a book available for purchase that contains 100 mini-puzzles within it. Juliana has a BS in Media Studies and Production from Temple University and has previously worked in marketing and media for companies like Rolling Stone, VICE, and The FADER. Juliana and Black Crossword have been featured in the New York Times, BET, the Huffington Post, and Good Morning America.   \n  \n This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources.   \n  \n This article has been viewed 2,736,252 times.\n\nSudoku puzzles may seem intimidating at first, but with a bit of practice, they’re pretty easy to solve. These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles.\n\n## Solving a Sudoku: Quick Tips\nStart by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row.\n## Steps\nSection 1 of 5:\n\n### Sudoku Rules & Layout\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n1. [![Step 1 Sudoku is played on a 9x9 grid of squares.](https:\/\/www.wikihow.com\/images\/thumb\/7\/7b\/Solve-a-Sudoku-Step-1-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-1-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-1-Version-2.jpg)\n   1\n   **Sudoku is played on a 9x9 grid of squares.** A sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled.[\\[1\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-1) X Research source\n   \n   - The larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern.\n2. [![Step 2 Fill the remaining numbers in, making sure they don’t repeat.](https:\/\/www.wikihow.com\/images\/thumb\/0\/09\/Solve-a-Sudoku-Step-2-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-2-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-2-Version-3.jpg)\n   2\n   **Fill the remaining numbers in, making sure they don’t repeat.** Each row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle.[\\[2\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-2) X Research source\n   \n   - For example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square.\n   - Similarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block.\n   - It’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better.\n\nSection 2 of 5:\n\n### Using the Scanning Strategy\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n1. [![Step 1 Look for a single empty cell in a block, column, or row.](https:\/\/www.wikihow.com\/images\/thumb\/c\/c6\/Solve-a-Sudoku-Step-3-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-3-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-3-Version-3.jpg)\n   1\n   **Look for a single empty cell in a block, column, or row.** Examine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9.[\\[3\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-3) X Research source\n   \n   - For example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in.\n   - Or, if a column has numbers 1-7 and 9, you know it’s missing the number “8.”\n   - This is one of the easiest strategies to use, especially when just starting the puzzle.\n2. [![Step 2 Scan rows or columns to fill in blocks.](https:\/\/www.wikihow.com\/images\/thumb\/c\/c8\/Solve-a-Sudoku-Step-4-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-4-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-4-Version-2.jpg)\n   2\n   **Scan rows or columns to fill in blocks.** Look at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning.[\\[4\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-4) X Research source\n   \n   - For example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block.\n   - Once you get the hang of scanning across just rows or columns, add the other direction as well.\n3. [![Step 3 Work in groups of numbers.](https:\/\/www.wikihow.com\/images\/thumb\/d\/d1\/Solve-a-Sudoku-Step-5-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-5-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-5-Version-3.jpg)\n   3\n   **Work in groups of numbers.** That is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat.[\\[5\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-5) X Research source\n   \n   - Another option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number \"6.\" See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can.\n\nSection 3 of 5:\n\n### Filling in Candidates\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n1. [![Step 1 Write down all “candidates” for a square.](https:\/\/www.wikihow.com\/images\/thumb\/f\/fb\/Solve-a-Sudoku-Step-6-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-6-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-6-Version-3.jpg)\n   1\n   **Write down all “candidates” for a square.** A candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in.[\\[6\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-6) X Research source\n2. [![Step 2 Look for “naked pairs.”](https:\/\/www.wikihow.com\/images\/thumb\/f\/f9\/Solve-a-Sudoku-Step-7-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-7-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-7-Version-3.jpg)\n   2\n   **Look for “naked pairs.”** A naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row.[\\[7\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-7) X Research source\n   \n   - For example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked.\n3. [![Step 3 Eliminate squares using hidden pairs.](https:\/\/www.wikihow.com\/images\/thumb\/7\/78\/Solve-a-Sudoku-Step-8-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-8-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-8-Version-3.jpg)\n   3\n   **Eliminate squares using hidden pairs.** Hidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers.[\\[8\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-8) X Research source\n   \n   - For example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block.\n4. [![Step 4 Try the X-wing technique on difficult puzzles.](https:\/\/www.wikihow.com\/images\/thumb\/8\/84\/Solve-a-Sudoku-Step-9-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-9-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-9-Version-3.jpg)\n   4\n   **Try the X-wing technique on difficult puzzles.** An X-wing is an advanced technique used to remove candidates in [difficult puzzles](https:\/\/www.wikihow.com\/Solve-Hard-Sudoku-Puzzles \"Solve Hard Sudoku Puzzles\"). First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the *columns* that contain those cells.[\\[9\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-9) X Research source\n   \n   - For example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row.\n\nSection 4 of 5:\n\n### Fixing Mistakes & Getting Unstuck\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n1. [![Step 1 Avoid guessing.](https:\/\/www.wikihow.com\/images\/thumb\/8\/89\/Solve-a-Sudoku-Step-10-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-10-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-10-Version-4.jpg)\n   1\n   **Avoid guessing.** If you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make.[\\[10\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-10) X Research source\n   \n   - If you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle.\n   - Recheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before.\n2. [![Step 2 Retrace your steps.](https:\/\/www.wikihow.com\/images\/thumb\/1\/10\/Solve-a-Sudoku-Step-11-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-11-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-11-Version-4.jpg)\n   2\n   **Retrace your steps.** It’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch.[\\[11\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-11) X Research source\n3. [![Step 3 Take a break.](https:\/\/www.wikihow.com\/images\/thumb\/7\/78\/Solve-a-Sudoku-Step-12-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-12-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-12-Version-4.jpg)\n   3\n   **Take a break.** If you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier.\n4. [![Step 4 Keep practicing.](https:\/\/www.wikihow.com\/images\/thumb\/3\/3e\/Solve-a-Sudoku-Step-13-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-13-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-13-Version-2.jpg)\n   4\n   **Keep practicing.** Sudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you [get stuck](https:\/\/www.wikihow.com\/Solve-Sudoku-when-Stuck \"Solve Sudoku when Stuck\"), don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help\\![\\[12\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-12)X [Expert Source](https:\/\/www.wikihow.com\/wikiHow:Delivering-a-Trustworthy-Experience) [![Phil Yu](https:\/\/www.wikihow.com\/images\/thumb\/4\/48\/Phil_Yu_.png\/-crop-100-100-100px-Phil_Yu_.png)Phil Yu Rubik's Cube Expert](https:\/\/www.wikihow.com\/Author\/Phil-Yu) Expert Interview [\\[13\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-13) X Research source\n\nSection 5 of 5:\n\n### Does sudoku involve math?\n\n[![PDF download](https:\/\/www.wikihow.com\/extensions\/wikihow\/socialstamp\/images\/icon-pdf.svg) Download Article](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n1. [![Sudoku is based on patterns, not math.](https:\/\/www.wikihow.com\/images\/thumb\/e\/e9\/Solve-a-Sudoku-Step-14-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-14-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-14-Version-2.jpg)\n   **Sudoku is based on patterns, not math.** While patterns are *technically* a part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way.[\\[14\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-14) X Research source\n\n### Sample Sudoku Puzzles\n[![](https:\/\/www.wikihow.com\/images\/thumb\/8\/8b\/Easy-Sudoku.png\/340px-Easy-Sudoku.png.webp)![](https:\/\/www.wikihow.com\/images\/thumb\/8\/8b\/Easy-Sudoku.png\/340px-Easy-Sudoku.png) Sample Easy Sudoku](https:\/\/www.wikihow.com\/Sample\/Easy-Sudoku)\n\n[![](https:\/\/www.wikihow.com\/images\/thumb\/7\/7c\/Intermediate-Sudoku.png\/340px-Intermediate-Sudoku.png.webp)![](https:\/\/www.wikihow.com\/images\/thumb\/7\/7c\/Intermediate-Sudoku.png\/340px-Intermediate-Sudoku.png) Sample Intermediate Sudoku](https:\/\/www.wikihow.com\/Sample\/Intermediate-Sudoku)\n\n[![](https:\/\/www.wikihow.com\/images\/thumb\/1\/10\/Hard-Sudoku.png\/340px-Hard-Sudoku.png.webp)![](https:\/\/www.wikihow.com\/images\/thumb\/1\/10\/Hard-Sudoku.png\/340px-Hard-Sudoku.png) Sample Hard Sudoku](https:\/\/www.wikihow.com\/Sample\/Hard-Sudoku)\n\n### Blank Sudoku Template\n[![](https:\/\/www.wikihow.com\/images\/thumb\/8\/87\/Blank-Sudoku.png\/340px-Blank-Sudoku.png.webp)![](https:\/\/www.wikihow.com\/images\/thumb\/8\/87\/Blank-Sudoku.png\/340px-Blank-Sudoku.png) Blank Sudoku Template](https:\/\/www.wikihow.com\/Sample\/Blank-Sudoku)\n\n## Community Q\\&A\nSearch\n\n[Add New Question]()\n\n- Question\n  \n  Are all sudoku puzzles solvable?\n  \n  ![Community Answer](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-104-104-104px-CommunityAvatar4.png)\n  \n  Community Answer\n  \n  Yes, unless the puzzle was printed with an error, which is unlikely.\n  \n  **Thanks! We're glad this was helpful.**  \n   **Thank you for your feedback.**  \n    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \\$1 helps us in our mission.  [Support wikiHow](https:\/\/www.wikihow.com\/wikiHow:Contribute)\n  \n  [Yes](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [No](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n  \n  [Not Helpful 37](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [Helpful 83](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n- Question\n  \n  When all of the squares are the correct numbers, can I assume the rows and columns are correct?\n  \n  ![Community Answer](https:\/\/www.wikihow.com\/images\/thumb\/0\/0a\/CommunityAvatar1.png\/-crop-104-104-104px-CommunityAvatar1.png)\n  \n  Community Answer\n  \n  The numbers in the 9 squares cannot be \"correct,\" as you say, unless the rows and columns are also correct. You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct.\n  \n  **Thanks! We're glad this was helpful.**  \n   **Thank you for your feedback.**  \n    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \\$1 helps us in our mission.  [Support wikiHow](https:\/\/www.wikihow.com\/wikiHow:Contribute)\n  \n  [Yes](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [No](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n  \n  [Not Helpful 26](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [Helpful 64](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n- Question\n  \n  Is there an easy way to play sudoku?\n  \n  ![Ellie](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-100-100-100px-CommunityAvatar4.png)\n  \n  Ellie\n  \n  Community Answer\n  \n  Once you get the hang of it, it will become pretty easy and fun.\n  \n  **Thanks! We're glad this was helpful.**  \n   **Thank you for your feedback.**  \n    If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \\$1 helps us in our mission.  [Support wikiHow](https:\/\/www.wikihow.com\/wikiHow:Contribute)\n  \n  [Yes](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [No](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n  \n  [Not Helpful 55](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [Helpful 42](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n[See more answers](https:\/\/www.wikihow.com\/Questions\/Solve-a-Sudoku#offset=3)\n\nAsk a Question\n\n200 characters left\n\nInclude your email address to get a message when this question is answered.\n\n[Submit]()\n\nAdvertisement\n\n## Video\n[Read Video Transcript](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n## Tips\n- It may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles\\!\n  Thanks\n  \n  [Helpful 3](https:\/\/www.wikihow.com\/Solve-a-Sudoku)   [Not Helpful 6](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\nSubmit a Tip\n\nAll tip submissions are carefully reviewed before being published\n\nName\n\nPlease provide your name and last initial\n\n[Submit](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\nThanks for submitting a tip for review\\!\n\nAdvertisement\n\n## Warnings\n- For every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle.\n  Thanks\n  \n  [Helpful 15](https:\/\/www.wikihow.com\/Solve-a-Sudoku)   [Not Helpful 4](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\nAdvertisement\n\n## You Might Also Like\n[![Do Sudoku Fast](https:\/\/www.wikihow.com\/images\/thumb\/d\/d0\/Do-Sudoku-Fast-Step-16.jpg\/-crop-342-184-245px-Do-Sudoku-Fast-Step-16.jpg.webp) How to Play Sudoku Quickly & Solve Puzzles in Record Time 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Sudoku Puzzle](https:\/\/www.wikihow.com\/images\/thumb\/5\/52\/Solve-3x3-Sudoku-Puzzle-Step-10.jpg\/-crop-342-184-245px-Solve-3x3-Sudoku-Puzzle-Step-10.jpg.webp)Sudoku Techniques: How to Solve a 3x3 Sudoku Puzzle ![](https:\/\/www.wikihow.com\/images\/thumb\/5\/52\/Solve-3x3-Sudoku-Puzzle-Step-10.jpg\/-crop-342-184-245px-Solve-3x3-Sudoku-Puzzle-Step-10.jpg)](https:\/\/www.wikihow.com\/Solve-3x3-Sudoku-Puzzle)\n\n[![Solve Kakuro](https:\/\/www.wikihow.com\/images\/thumb\/1\/12\/Solve-Kakuro-Step-13.jpg\/-crop-342-184-245px-Solve-Kakuro-Step-13.jpg.webp) How to Play & Finish Kakuro Number Puzzles ![](https:\/\/www.wikihow.com\/images\/thumb\/1\/12\/Solve-Kakuro-Step-13.jpg\/-crop-342-184-245px-Solve-Kakuro-Step-13.jpg)](https:\/\/www.wikihow.com\/Solve-Kakuro)\n\n[![Create a Sudoku](https:\/\/www.wikihow.com\/images\/thumb\/f\/ff\/Create-a-Sudoku-Step-15-Version-2.jpg\/-crop-342-184-327px-Create-a-Sudoku-Step-15-Version-2.jpg.webp) How to Create a Sudoku 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Puzzles](https:\/\/www.wikihow.com\/images\/thumb\/c\/c3\/Solve-Slide-Puzzles-Step-18.jpg\/-crop-342-184-245px-Solve-Slide-Puzzles-Step-18.jpg.webp) How to Solve Slider Puzzles of Any Size ![](https:\/\/www.wikihow.com\/images\/thumb\/c\/c3\/Solve-Slide-Puzzles-Step-18.jpg\/-crop-342-184-245px-Solve-Slide-Puzzles-Step-18.jpg)](https:\/\/www.wikihow.com\/Solve-Slide-Puzzles)\n\n[![Finish a Crossword Puzzle](https:\/\/www.wikihow.com\/images\/thumb\/b\/b5\/Finish-a-Crossword-Puzzle-Step-9-Version-2.jpg\/-crop-342-184-245px-Finish-a-Crossword-Puzzle-Step-9-Version-2.jpg.webp) How to Do a Crossword Puzzle (+ Solve Every Clue) ![](https:\/\/www.wikihow.com\/images\/thumb\/b\/b5\/Finish-a-Crossword-Puzzle-Step-9-Version-2.jpg\/-crop-342-184-245px-Finish-a-Crossword-Puzzle-Step-9-Version-2.jpg)](https:\/\/www.wikihow.com\/Finish-a-Crossword-Puzzle)\n\n[![Play Picross DS](https:\/\/www.wikihow.com\/images\/thumb\/4\/48\/Picross_09_691.png\/-crop-342-184-234px-Picross_09_691.png.webp) How to Play Picross DS ![](https:\/\/www.wikihow.com\/images\/thumb\/4\/48\/Picross_09_691.png\/-crop-342-184-234px-Picross_09_691.png)](https:\/\/www.wikihow.com\/Play-Picross-DS)\n\n[![Solve a Magic Square](https:\/\/www.wikihow.com\/images\/thumb\/e\/ec\/Solve-a-Magic-Square-Step-18.jpg\/-crop-342-184-245px-Solve-a-Magic-Square-Step-18.jpg.webp)3 Ways to Solve Magic Square Math Puzzles ![](https:\/\/www.wikihow.com\/images\/thumb\/e\/ec\/Solve-a-Magic-Square-Step-18.jpg\/-crop-342-184-245px-Solve-a-Magic-Square-Step-18.jpg)](https:\/\/www.wikihow.com\/Solve-a-Magic-Square)\n\nAdvertisement\n\n## References\n1. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-1) <https:\/\/bestofsudoku.com\/sudoku-strategy>\n2. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-2) <https:\/\/www.pennydellpuzzles.com\/wp-content\/uploads\/2019\/03\/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W>\n3. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-3) <https:\/\/www.stolaf.edu\/people\/hansonr\/sudoku\/explain.htm>\n4. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-4) <https:\/\/www.stolaf.edu\/people\/hansonr\/sudoku\/explain.htm>\n5. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-5) <https:\/\/bestofsudoku.com\/sudoku-strategy>\n6. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-6) <https:\/\/www.pennydellpuzzles.com\/wp-content\/uploads\/2019\/03\/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W>\n7. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-7) <https:\/\/www.pennydellpuzzles.com\/wp-content\/uploads\/2019\/03\/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W>\n8. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-8) <https:\/\/www.pennydellpuzzles.com\/wp-content\/uploads\/2019\/03\/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W>\n9. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-9) <https:\/\/www.sudoku.org.uk\/SolvingTechniques\/X-WingFamily.asp>\n\n[More References (5)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#aiinfo)\n\n1. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-10) <https:\/\/bestofsudoku.com\/sudoku-strategy>\n2. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-11) <https:\/\/bestofsudoku.com\/sudoku-strategy>\n3. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-12) Phil Yu. Rubik's Cube Expert. Expert Interview\n4. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-13) <https:\/\/sudoku.com\/how-to-play\/how-to-improve-your-sudoku-skills-in-5-minutes-or-less\/>\n5. [↑](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_ref-14) <https:\/\/bestofsudoku.com\/sudoku-strategy>\n\n## About This Article\n![Juliana Pache](https:\/\/www.wikihow.com\/images\/thumb\/9\/9c\/Juliana_Pache_.png\/-crop-100-100-100px-Juliana_Pache_.png)\n\nCo-authored by:\n\n[Juliana Pache](https:\/\/www.wikihow.com\/Author\/Juliana-Pache)\n\nCrossword Puzzle Expert\n\nThis article was co-authored by [Juliana Pache](https:\/\/www.wikihow.com\/Author\/Juliana-Pache) and by wikiHow staff writer, [Raven Minyard, BA](https:\/\/www.wikihow.com\/Author\/Raven-Minyard-BA). Juliana Pache is a puzzle maker based in Brooklyn, NY. Juliana is passionate about Black diasporic legacies and creates puzzles that engage with Black popular culture. She founded Black Crossword, the premier destination for word gamers interested in Black culture and the diaspora. Black Crossword launched in 2023 and offers a free daily mini puzzle, with plans to launch standard-size puzzles under a subscription. There is also a book available for purchase that contains 100 mini-puzzles within it. Juliana has a BS in Media Studies and Production from Temple University and has previously worked in marketing and media for companies like Rolling Stone, VICE, and The FADER. Juliana and Black Crossword have been featured in the New York Times, BET, the Huffington Post, and Good Morning America. This article has been viewed 2,736,252 times.\n\n22 votes - 57%\n\nCo-authors: 110\n\nUpdated: February 19, 2026\n\nViews: 2,736,252\n\nCategories: [Featured Articles](https:\/\/www.wikihow.com\/Category:Featured-Articles \"Category:Featured Articles\") \\| [Mathematical Puzzles](https:\/\/www.wikihow.com\/Category:Mathematical-Puzzles \"Category:Mathematical Puzzles\")\n\n[Article SummaryX](https:\/\/www.wikihow.com\/Solve-a-Sudoku#summary_wrapper)\n\nSudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game! To learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on\\!\n\nDid this summary help you?\n\nYes\n\nNo\n\n[In other languages](https:\/\/www.wikihow.com\/Solve-a-Sudoku#other_languages)\n\n[Italian](https:\/\/www.wikihow.it\/Risolvere-il-Sudoku)\n\n[Spanish](https:\/\/es.wikihow.com\/resolver-un-sudoku)\n\n[Portuguese](https:\/\/pt.wikihow.com\/Resolver-um-Sudoku)\n\n[Dutch](https:\/\/nl.wikihow.com\/Een-sudoku-oplossen)\n\n[French](https:\/\/fr.wikihow.com\/r%C3%A9ussir-un-sudoku)\n\n[German](https:\/\/de.wikihow.com\/Sudokus-l%C3%B6sen)\n\n[Russian](https:\/\/ru.wikihow.com\/%D1%80%D0%B5%D1%88%D0%B0%D1%82%D1%8C-%D1%81%D1%83%D0%B4%D0%BE%D0%BA%D1%83)\n\n[Indonesian](https:\/\/id.wikihow.com\/Memecahkan-Teka-teki-Sudoku)\n\n[Czech](https:\/\/www.wikihow.cz\/Jak-vylu%C5%A1tit-Sudoku)\n\n[Chinese](https:\/\/zh.wikihow.com\/%E8%A7%A3%E6%95%B0%E7%8B%AC)\n\n[Thai](https:\/\/th.wikihow.com\/%E0%B9%81%E0%B8%81%E0%B9%89%E0%B8%9B%E0%B8%A3%E0%B8%B4%E0%B8%A8%E0%B8%99%E0%B8%B2%E0%B8%8B%E0%B8%B9%E0%B9%82%E0%B8%94%E0%B8%84%E0%B8%B8)\n\n[Hindi](https:\/\/hi.wikihow.com\/%E0%A4%B8%E0%A5%81%E0%A4%A1%E0%A5%8B%E0%A4%95%E0%A5%82-%E0%A4%B8%E0%A5%81%E0%A4%B2%E0%A4%9D%E0%A4%BE%E0%A4%8F%E0%A4%82)\n\n[Arabic](https:\/\/ar.wikihow.com\/%D8%AD%D9%84-%D9%84%D8%B9%D8%A8%D8%A9-%D8%B3%D9%88%D8%AF%D9%88%D9%83%D9%88)\n\n[Korean](https:\/\/ko.wikihow.com\/%EC%8A%A4%EB%8F%84%EC%BF%A0-%ED%91%B8%EB%8A%94-%EB%B2%95)\n\n[Vietnamese](https:\/\/www.wikihow.vn\/Gi%E1%BA%A3i-sudoku)\n\n[Japanese](https:\/\/www.wikihow.jp\/%E6%95%B0%E7%8B%AC%E3%81%AE%E5%95%8F%E9%A1%8C%E3%82%92%E8%A7%A3%E3%81%8F)\n\n- [Print](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n- [Send fan mail to authors](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\nThanks to all authors for creating a page that has been read 2,736,252 times.\n\n## Reader Success Stories\n- ![Janet Clark](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-72-72-72px-CommunityAvatar4.png)\n  \n  Janet Clark\n  \n  Jun 25, 2018\n  \"My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It looked too difficult for me. However, I am holding my own with him after reading the strategic steps and tips. Thank you.\"...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n[More reader stories](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [Hide reader stories](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n[Share your story](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n## Did this article help you?\nYes\n\nNo\n\n[![](https:\/\/www.wikihow.com\/images\/d\/d7\/Tech_v15_0728x0180%402x.jpg)![](https:\/\/www.wikihow.com\/images\/d\/d7\/Tech_v15_0728x0180%402x.jpg)](https:\/\/www.wikihow.com\/Tech-Help-Pro?utm_source=wikihow&utm_medium=bottom&utm_campaign=techhelppro_tech_v15)\n\nAdvertisement\n\nCookies make wikiHow better. By continuing to use our site, you agree to our [cookie policy](https:\/\/www.wikihow.com\/wikiHow:Cookie-Policy).\n\n![Juliana Pache](https:\/\/www.wikihow.com\/images\/thumb\/9\/9c\/Juliana_Pache_.png\/-crop-100-100-100px-Juliana_Pache_.png)\n\nCo-authored by:\n\n[Juliana Pache](https:\/\/www.wikihow.com\/Author\/Juliana-Pache)\n\nCrossword Puzzle Expert\n\n22 votes - 57%\n\nClick a star to vote\n\nCo-authors: 110\n\nUpdated: February 19, 2026\n\nViews: 2,736,252\n\n![Janet Clark](https:\/\/www.wikihow.com\/images\/thumb\/0\/0a\/CommunityAvatar1.png\/-crop-72-72-72px-CommunityAvatar1.png)\n\nJanet Clark\n\nJun 25, 2018\n\n\"My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It looked too difficult for me. However, I am holding my own with him after reading the strategic steps and tips. Thank you.\"...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n![Neill Conroy](https:\/\/www.wikihow.com\/images\/thumb\/0\/0a\/CommunityAvatar1.png\/-crop-72-72-72px-CommunityAvatar1.png)\n\nNeill Conroy\n\nJun 6, 2016\n\n\"Highlighting all the ones by drawing lines in their row and column makes a huge difference. Also, using dots in a grid instead of writing the actual number saves a lot of confusion, as long as you are very neat and VERY careful!\"...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n![Anonymous](https:\/\/www.wikihow.com\/images\/thumb\/0\/0a\/CommunityAvatar1.png\/-crop-72-72-72px-CommunityAvatar1.png)\n\nAnonymous\n\nOct 29, 2017\n\n\"Starting out with the basics helped. I had no idea what to do to start. I also didn't know that there were 9 smaller squares that required 1-9. I started off doing long rows until I read your article.\"...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n![Trevor Morgan](https:\/\/www.wikihow.com\/images\/thumb\/b\/b0\/CommunityAvatar2.png\/-crop-72-72-72px-CommunityAvatar2.png)\n\nTrevor Morgan\n\nSep 26, 2016\n\n\"Putting the possible numbers in a square in pencil was the best help. I can solve easy and medium puzzles now, fantastic.\"...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n![NANDKUMAR A.](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-72-72-72px-CommunityAvatar4.png)\n\nNANDKUMAR A.\n\nApr 3, 2024\n\n\"After many searches I found this quite clear with examples.\"\n\n[Share yours\\!](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [More success stories](https:\/\/www.wikihow.com\/Solve-a-Sudoku) [Hide success stories](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n\n### Quizzes & Games\n[![Am I Smart Quiz](https:\/\/www.wikihow.com\/images\/thumb\/a\/a2\/Am_i_smart_quiz.png\/-crop-127-140-127px-Am_i_smart_quiz.png)Quiz Am I Smart QuizTake Quiz](https:\/\/www.wikihow.com\/Am-I-Smart)\n\n[![IQ Test](https:\/\/www.wikihow.com\/images\/thumb\/5\/5d\/Iq_test.png\/-crop-127-140-127px-Iq_test.png)Quiz IQ TestTake Quiz](https:\/\/www.wikihow.com\/IQ-Test)\n\n[![Cognitive Test](https:\/\/www.wikihow.com\/images\/thumb\/2\/2a\/Cognitive_test.png\/-crop-127-140-127px-Cognitive_test.png)Quiz Cognitive TestTake Quiz](https:\/\/www.wikihow.com\/Cognitive-Test)\n\n[![What Age Is My Brain Quiz](https:\/\/www.wikihow.com\/images\/thumb\/a\/ae\/Brain_test.png\/-crop-127-140-127px-Brain_test.png)Quiz What Age Is My Brain QuizTake Quiz](https:\/\/www.wikihow.com\/Brain-Test)\n\n### You Might Also Like\n[![ Play Sudoku Quickly & Solve Puzzles in Record Time](https:\/\/www.wikihow.com\/images\/thumb\/d\/d0\/Do-Sudoku-Fast-Step-16.jpg\/-crop-127-140-127px-Do-Sudoku-Fast-Step-16.jpg)How to Play Sudoku Quickly & Solve Puzzles in Record Time](https:\/\/www.wikihow.com\/Do-Sudoku-Fast)\n\n[![Solve Hard Sudoku Puzzles](https:\/\/www.wikihow.com\/images\/thumb\/9\/9b\/Solve-Hard-Sudoku-Puzzles-Step-13.jpg\/-crop-127-140-127px-Solve-Hard-Sudoku-Puzzles-Step-13.jpg)How to Solve Hard Sudoku Puzzles](https:\/\/www.wikihow.com\/Solve-Hard-Sudoku-Puzzles)\n\n[![12 Strategies to Beat Sudoku When You’re Stuck](https:\/\/www.wikihow.com\/images\/thumb\/d\/da\/Solve-Sudoku-when-Stuck-Step-10.jpg\/-crop-127-140-127px-Solve-Sudoku-when-Stuck-Step-10.jpg)12 Strategies to Beat Sudoku When You’re Stuck](https:\/\/www.wikihow.com\/Solve-Sudoku-when-Stuck)\n\n[![The Best Tricks for Solving Hard Sudoku Puzzles](https:\/\/www.wikihow.com\/images\/thumb\/c\/cb\/Sudoku-Tricks-Step-23.jpg\/-crop-127-140-127px-Sudoku-Tricks-Step-23.jpg)The Best Tricks for Solving Hard Sudoku Puzzles](https:\/\/www.wikihow.com\/Sudoku-Tricks)\n\n### Trending Articles\n[![What Would I Go to Jail For?](https:\/\/www.wikihow.com\/images\/thumb\/4\/42\/Arrange-for-Bail-While-in-Jail-Step-2-Version-4.jpg\/-crop-127-140-127px-Arrange-for-Bail-While-in-Jail-Step-2-Version-4.jpg)Quiz What Would I Go to Jail For?Take Quiz](https:\/\/www.wikihow.com\/What-Would-You-Go-to-Jail-for-Quiz)\n\n[![Am I a Nerd or Mean Girl?](https:\/\/www.wikihow.com\/images\/thumb\/3\/39\/Quiz-nerdy-mean-girls.png\/-crop-127-140-127px-Quiz-nerdy-mean-girls.png)Quiz Am I a Nerd or Mean Girl?Take Quiz](https:\/\/www.wikihow.com\/Nerd-or-Mean-Girls-Quiz)\n\n[![65+ Sexy Poses for Your Next Seductive Selfie](https:\/\/www.wikihow.com\/images\/thumb\/e\/e1\/Best-Dating-Apps-Post-COVID-Step-14.jpg\/-crop-127-140-127px-Best-Dating-Apps-Post-COVID-Step-14.jpg)65+ Sexy Poses for Your Next Seductive Selfie](https:\/\/www.wikihow.com\/Hot-Selfie-Pose-Ideas)\n\n[![What's My Greatest Strength?](https:\/\/www.wikihow.com\/images\/thumb\/5\/51\/Define-Your-Personality-Step-1-Version-2.jpg\/-crop-127-140-127px-Define-Your-Personality-Step-1-Version-2.jpg)Quiz What's My Greatest Strength?Take Quiz](https:\/\/www.wikihow.com\/Greatest-Strength-Quiz)\n\n### Trending Articles\n[![What Would My Cartoon Animal Sidekick Be?](https:\/\/www.wikihow.com\/images\/thumb\/4\/4b\/Quiz-cartoon-animal--sidekicks-main.png\/-crop-127-140-127px-Quiz-cartoon-animal--sidekicks-main.png)Quiz What Would My Cartoon Animal Sidekick Be?Take Quiz](https:\/\/www.wikihow.com\/What-Would-My-Cartoon-Animal-Sidekick-Be)\n\n[![How Well Do I Know Gen Z Slang Quiz](https:\/\/www.wikihow.com\/images\/thumb\/a\/a0\/Gen_z_slang.png\/-crop-127-140-127px-Gen_z_slang.png)Quiz How Well Do I Know Gen Z Slang QuizTake Quiz](https:\/\/www.wikihow.com\/Gen-Z-Slang-Quiz)\n\n[![Who Is My Soulmate Quiz](https:\/\/www.wikihow.com\/images\/thumb\/a\/ae\/Soulmate_quiz_pic.png\/-crop-127-140-127px-Soulmate_quiz_pic.png)Quiz Who Is My Soulmate QuizTake Quiz](https:\/\/www.wikihow.com\/Relationships\/Soulmate-Quiz)\n\n[![Am I Good at Flirting Quiz](https:\/\/www.wikihow.com\/images\/thumb\/d\/df\/Good_at_flirting.png\/-crop-127-140-127px-Good_at_flirting.png)Quiz Am I Good at Flirting QuizTake Quiz](https:\/\/www.wikihow.com\/Am-I-Good-at-Flirting-Quiz)\n\n### Take the Quiz. 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These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles.\n\n## Solving a Sudoku: Quick Tips\nStart by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row.\n\n1. [![Step 1 Sudoku is played on a 9x9 grid of squares.](https:\/\/www.wikihow.com\/images\/thumb\/7\/7b\/Solve-a-Sudoku-Step-1-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-1-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-1-Version-2.jpg)\n   A sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled.[\\[1\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-1)\n   \n   - The larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern.\n2. [![Step 2 Fill the remaining numbers in, making sure they don’t repeat.](https:\/\/www.wikihow.com\/images\/thumb\/0\/09\/Solve-a-Sudoku-Step-2-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-2-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-2-Version-3.jpg)\n   Each row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle.[\\[2\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-2)\n   \n   - For example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square.\n   - Similarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block.\n   - It’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better.\n\n1. [![Step 1 Look for a single empty cell in a block, column, or row.](https:\/\/www.wikihow.com\/images\/thumb\/c\/c6\/Solve-a-Sudoku-Step-3-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-3-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-3-Version-3.jpg)\n   Examine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9.[\\[3\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-3)\n   \n   - For example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in.\n   - Or, if a column has numbers 1-7 and 9, you know it’s missing the number “8.”\n   - This is one of the easiest strategies to use, especially when just starting the puzzle.\n2. [![Step 2 Scan rows or columns to fill in blocks.](https:\/\/www.wikihow.com\/images\/thumb\/c\/c8\/Solve-a-Sudoku-Step-4-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-4-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-4-Version-2.jpg)\n   Look at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning.[\\[4\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-4)\n   \n   - For example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block.\n   - Once you get the hang of scanning across just rows or columns, add the other direction as well.\n3. [![Step 3 Work in groups of numbers.](https:\/\/www.wikihow.com\/images\/thumb\/d\/d1\/Solve-a-Sudoku-Step-5-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-5-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-5-Version-3.jpg)\n   That is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat.[\\[5\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-5)\n   \n   - Another option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number \"6.\" See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can.\n\n1. [![Step 1 Write down all “candidates” for a square.](https:\/\/www.wikihow.com\/images\/thumb\/f\/fb\/Solve-a-Sudoku-Step-6-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-6-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-6-Version-3.jpg)\n   A candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in.[\\[6\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-6)\n2. [![Step 2 Look for “naked pairs.”](https:\/\/www.wikihow.com\/images\/thumb\/f\/f9\/Solve-a-Sudoku-Step-7-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-7-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-7-Version-3.jpg)\n   A naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row.[\\[7\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-7)\n   \n   - For example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked.\n3. [![Step 3 Eliminate squares using hidden pairs.](https:\/\/www.wikihow.com\/images\/thumb\/7\/78\/Solve-a-Sudoku-Step-8-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-8-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-8-Version-3.jpg)\n   Hidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers.[\\[8\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-8)\n   \n   - For example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block.\n4. [![Step 4 Try the X-wing technique on difficult puzzles.](https:\/\/www.wikihow.com\/images\/thumb\/8\/84\/Solve-a-Sudoku-Step-9-Version-3.jpg\/v4-460px-Solve-a-Sudoku-Step-9-Version-3.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-9-Version-3.jpg)\n   An X-wing is an advanced technique used to remove candidates in [difficult puzzles](https:\/\/www.wikihow.com\/Solve-Hard-Sudoku-Puzzles \"Solve Hard Sudoku Puzzles\"). First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the *columns* that contain those cells.[\\[9\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-9)\n   \n   - For example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row.\n\n1. [![Step 1 Avoid guessing.](https:\/\/www.wikihow.com\/images\/thumb\/8\/89\/Solve-a-Sudoku-Step-10-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-10-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-10-Version-4.jpg)\n   If you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make.[\\[10\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-10)\n   \n   - If you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle.\n   - Recheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before.\n2. [![Step 2 Retrace your steps.](https:\/\/www.wikihow.com\/images\/thumb\/1\/10\/Solve-a-Sudoku-Step-11-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-11-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-11-Version-4.jpg)\n   It’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch.[\\[11\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-11)\n3. [![Step 3 Take a break.](https:\/\/www.wikihow.com\/images\/thumb\/7\/78\/Solve-a-Sudoku-Step-12-Version-4.jpg\/v4-460px-Solve-a-Sudoku-Step-12-Version-4.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-12-Version-4.jpg)\n   If you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier.\n4. [![Step 4 Keep practicing.](https:\/\/www.wikihow.com\/images\/thumb\/3\/3e\/Solve-a-Sudoku-Step-13-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-13-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-13-Version-2.jpg)\n   Sudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you [get stuck](https:\/\/www.wikihow.com\/Solve-Sudoku-when-Stuck \"Solve Sudoku when Stuck\"), don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help\\![\\[12\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-12) [\\[13\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-13)\n\n1. [![Sudoku is based on patterns, not math.](https:\/\/www.wikihow.com\/images\/thumb\/e\/e9\/Solve-a-Sudoku-Step-14-Version-2.jpg\/v4-460px-Solve-a-Sudoku-Step-14-Version-2.jpg)](https:\/\/www.wikihow.com\/Solve-a-Sudoku#\/Image:Solve-a-Sudoku-Step-14-Version-2.jpg)\n   While patterns are *technically* a part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way.[\\[14\\]](https:\/\/www.wikihow.com\/Solve-a-Sudoku#_note-14)\n### Sample Sudoku Puzzles\n### Blank Sudoku Template\nSearch\n\n[Add New Question]()\n\n- Question\n  \n  Are all sudoku puzzles solvable?\n  \n  ![Community Answer](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-104-104-104px-CommunityAvatar4.png)\n  \n  Community Answer\n  \n  Yes, unless the puzzle was printed with an error, which is unlikely.\n- Question\n  \n  When all of the squares are the correct numbers, can I assume the rows and columns are correct?\n  \n  ![Community Answer](https:\/\/www.wikihow.com\/images\/thumb\/0\/0a\/CommunityAvatar1.png\/-crop-104-104-104px-CommunityAvatar1.png)\n  \n  Community Answer\n  \n  The numbers in the 9 squares cannot be \"correct,\" as you say, unless the rows and columns are also correct. You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct.\n- Question\n  \n  Is there an easy way to play sudoku?\n  \n  ![Ellie](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-100-100-100px-CommunityAvatar4.png)\n  \n  Ellie\n  \n  Community Answer\n  \n  Once you get the hang of it, it will become pretty easy and fun.\n\n[See more answers](https:\/\/www.wikihow.com\/Questions\/Solve-a-Sudoku#offset=3)\n\nAsk a Question\n\n200 characters left\n\nInclude your email address to get a message when this question is answered.\n\n[Submit]()\n\nAdvertisement\n\n- It may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles\\!\n  Thanks\n\nThanks for submitting a tip for review\\!\n\nAdvertisement\n\n- For every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle.\n  Thanks\n\nAdvertisement\n## References\nAbout This Article\n\n[Article SummaryX](https:\/\/www.wikihow.com\/Solve-a-Sudoku#summary_wrapper)\n\nSudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game! To learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on\\!\n\nDid this summary help you?\n\nThanks to all authors for creating a page that has been read 2,736,252 times.\n\nReader Success Stories\n\n- ![Janet Clark](https:\/\/www.wikihow.com\/images\/thumb\/f\/f5\/CommunityAvatar4.png\/-crop-72-72-72px-CommunityAvatar4.png)\n  \n  Janet Clark\n  \n  Jun 25, 2018\n  \"My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It...\" [more](https:\/\/www.wikihow.com\/Solve-a-Sudoku)\n## Did this article help you?","meta_canonical":null}

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Meta Title	How to Solve a Sudoku: Easy Tips & Tricks for Beginners
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Boilerpipe Text	Download Article Try these simple strategies to improve your sudoku skills Download Article Sudoku Rules & Layout \| Using the Scanning Strategy \| Filling in Candidates \| Fixing Mistakes \| Does sudoku involve math? \| Video \| Q&A Sudoku puzzles may seem intimidating at first, but with a bit of practice, they’re pretty easy to solve. These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles. Solving a Sudoku: Quick Tips Start by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row. A sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled. [1] The larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern. Each row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle. [2] For example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square. Similarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block. It’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better. Advertisement Examine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9. [3] For example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in. Or, if a column has numbers 1-7 and 9, you know it’s missing the number “8.” This is one of the easiest strategies to use, especially when just starting the puzzle. Look at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning. [4] For example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block. Once you get the hang of scanning across just rows or columns, add the other direction as well. That is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat. [5] Another option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number "6." See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can. Advertisement A candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in. [6] A naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row. [7] For example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked. Hidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers. [8] For example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block. An X-wing is an advanced technique used to remove candidates in difficult puzzles . First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the columns that contain those cells. [9] For example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row. Advertisement If you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make. [10] If you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle. Recheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before. It’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch. [11] If you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier. Sudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you get stuck , don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help! [12] [13] Advertisement While patterns are technically a part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way. [14] Sample Sudoku Puzzles Blank Sudoku Template Search Add New Question Question Are all sudoku puzzles solvable? Community Answer Yes, unless the puzzle was printed with an error, which is unlikely. Question When all of the squares are the correct numbers, can I assume the rows and columns are correct? Community Answer The numbers in the 9 squares cannot be "correct," as you say, unless the rows and columns are also correct. You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct. Question Is there an easy way to play sudoku? Ellie Community Answer Once you get the hang of it, it will become pretty easy and fun. See more answers Ask a Question 200 characters left Include your email address to get a message when this question is answered. Submit Advertisement It may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles! Thanks Thanks for submitting a tip for review! Advertisement For every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle. Thanks Advertisement References About This Article Article Summary X Sudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game! To learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on! Did this summary help you? Thanks to all authors for creating a page that has been read 2,736,252 times. Reader Success Stories Janet Clark Jun 25, 2018 "My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It ..." more Did this article help you?
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Learn why people trust wikiHow](https://www.wikihow.com/wikiHow:Delivering-a-Trustworthy-Experience) - [Categories](https://www.wikihow.com/Special:CategoryListing "Special:CategoryListing") - [Hobbies and Crafts](https://www.wikihow.com/Category:Hobbies-and-Crafts "Category:Hobbies and Crafts") - [Games](https://www.wikihow.com/Category:Games "Category:Games") - [Puzzles and Memory Games](https://www.wikihow.com/Category:Puzzles-and-Memory-Games "Category:Puzzles and Memory Games") - [Mathematical Puzzles](https://www.wikihow.com/Category:Mathematical-Puzzles "Category:Mathematical Puzzles") # [How to Play Sudoku & Solve Any Puzzle: Beginner & Advanced Tips](https://www.wikihow.com/Solve-a-Sudoku) [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) Try these simple strategies to improve your sudoku skills Co-authored by [Juliana Pache](https://www.wikihow.com/Author/Juliana-Pache) and [Raven Minyard, BA](https://www.wikihow.com/Author/Raven-Minyard-BA) [Last Updated: February 19, 2026](https://www.wikihow.com/Solve-a-Sudoku) [Fact Checked](https://www.wikihow.com/Solve-a-Sudoku) [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) - [Sudoku Rules & Layout](https://www.wikihow.com/Solve-a-Sudoku#Sudoku-Rules-.26-Layout) - [Using the Scanning Strategy](https://www.wikihow.com/Solve-a-Sudoku#Using-the-Scanning-Strategy) - [Filling in Candidates](https://www.wikihow.com/Solve-a-Sudoku#Filling-in-Candidates) - [Fixing Mistakes](https://www.wikihow.com/Solve-a-Sudoku#Fixing-Mistakes-.26-Getting-Unstuck) - [Does sudoku involve math?](https://www.wikihow.com/Solve-a-Sudoku#Does-sudoku-involve-math.3F) - [Video](https://www.wikihow.com/Solve-a-Sudoku#Video) - [Q\&A](https://www.wikihow.com/Solve-a-Sudoku#qa_headline) \\|Show more \\|Show less [ARTICLE](https://www.wikihow.com/Solve-a-Sudoku#steps_1) [VIDEO](https://www.wikihow.com/Solve-a-Sudoku#Video) X This article was co-authored by [Juliana Pache](https://www.wikihow.com/Author/Juliana-Pache) and by wikiHow staff writer, [Raven Minyard, BA](https://www.wikihow.com/Author/Raven-Minyard-BA). Juliana Pache is a puzzle maker based in Brooklyn, NY. Juliana is passionate about Black diasporic legacies and creates puzzles that engage with Black popular culture. She founded Black Crossword, the premier destination for word gamers interested in Black culture and the diaspora. Black Crossword launched in 2023 and offers a free daily mini puzzle, with plans to launch standard-size puzzles under a subscription. There is also a book available for purchase that contains 100 mini-puzzles within it. Juliana has a BS in Media Studies and Production from Temple University and has previously worked in marketing and media for companies like Rolling Stone, VICE, and The FADER. Juliana and Black Crossword have been featured in the New York Times, BET, the Huffington Post, and Good Morning America. This article has been fact-checked, ensuring the accuracy of any cited facts and confirming the authority of its sources. This article has been viewed 2,736,252 times. Sudoku puzzles may seem intimidating at first, but with a bit of practice, they’re pretty easy to solve. These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles. ## Solving a Sudoku: Quick Tips Start by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row. ## Steps Section 1 of 5: ### Sudoku Rules & Layout [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) 1. [![Step 1 Sudoku is played on a 9x9 grid of squares.](https://www.wikihow.com/images/thumb/7/7b/Solve-a-Sudoku-Step-1-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-1-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-1-Version-2.jpg) 1 Sudoku is played on a 9x9 grid of squares. A sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled.[\[1\]](https://www.wikihow.com/Solve-a-Sudoku#_note-1) X Research source - The larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern. 2. [![Step 2 Fill the remaining numbers in, making sure they don’t repeat.](https://www.wikihow.com/images/thumb/0/09/Solve-a-Sudoku-Step-2-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-2-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-2-Version-3.jpg) 2 Fill the remaining numbers in, making sure they don’t repeat. Each row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle.[\[2\]](https://www.wikihow.com/Solve-a-Sudoku#_note-2) X Research source - For example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square. - Similarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block. - It’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better. Section 2 of 5: ### Using the Scanning Strategy [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) 1. [![Step 1 Look for a single empty cell in a block, column, or row.](https://www.wikihow.com/images/thumb/c/c6/Solve-a-Sudoku-Step-3-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-3-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-3-Version-3.jpg) 1 Look for a single empty cell in a block, column, or row. Examine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9.[\[3\]](https://www.wikihow.com/Solve-a-Sudoku#_note-3) X Research source - For example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in. - Or, if a column has numbers 1-7 and 9, you know it’s missing the number “8.” - This is one of the easiest strategies to use, especially when just starting the puzzle. 2. [![Step 2 Scan rows or columns to fill in blocks.](https://www.wikihow.com/images/thumb/c/c8/Solve-a-Sudoku-Step-4-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-4-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-4-Version-2.jpg) 2 Scan rows or columns to fill in blocks. Look at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning.[\[4\]](https://www.wikihow.com/Solve-a-Sudoku#_note-4) X Research source - For example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block. - Once you get the hang of scanning across just rows or columns, add the other direction as well. 3. [![Step 3 Work in groups of numbers.](https://www.wikihow.com/images/thumb/d/d1/Solve-a-Sudoku-Step-5-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-5-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-5-Version-3.jpg) 3 Work in groups of numbers. That is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat.[\[5\]](https://www.wikihow.com/Solve-a-Sudoku#_note-5) X Research source - Another option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number "6." See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can. Section 3 of 5: ### Filling in Candidates [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) 1. [![Step 1 Write down all “candidates” for a square.](https://www.wikihow.com/images/thumb/f/fb/Solve-a-Sudoku-Step-6-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-6-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-6-Version-3.jpg) 1 Write down all “candidates” for a square. A candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in.[\[6\]](https://www.wikihow.com/Solve-a-Sudoku#_note-6) X Research source 2. [![Step 2 Look for “naked pairs.”](https://www.wikihow.com/images/thumb/f/f9/Solve-a-Sudoku-Step-7-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-7-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-7-Version-3.jpg) 2 Look for “naked pairs.” A naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row.[\[7\]](https://www.wikihow.com/Solve-a-Sudoku#_note-7) X Research source - For example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked. 3. [![Step 3 Eliminate squares using hidden pairs.](https://www.wikihow.com/images/thumb/7/78/Solve-a-Sudoku-Step-8-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-8-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-8-Version-3.jpg) 3 Eliminate squares using hidden pairs. Hidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers.[\[8\]](https://www.wikihow.com/Solve-a-Sudoku#_note-8) X Research source - For example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block. 4. [![Step 4 Try the X-wing technique on difficult puzzles.](https://www.wikihow.com/images/thumb/8/84/Solve-a-Sudoku-Step-9-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-9-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-9-Version-3.jpg) 4 Try the X-wing technique on difficult puzzles. An X-wing is an advanced technique used to remove candidates in [difficult puzzles](https://www.wikihow.com/Solve-Hard-Sudoku-Puzzles "Solve Hard Sudoku Puzzles"). First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the columns that contain those cells.[\[9\]](https://www.wikihow.com/Solve-a-Sudoku#_note-9) X Research source - For example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row. Section 4 of 5: ### Fixing Mistakes & Getting Unstuck [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) 1. [![Step 1 Avoid guessing.](https://www.wikihow.com/images/thumb/8/89/Solve-a-Sudoku-Step-10-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-10-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-10-Version-4.jpg) 1 Avoid guessing. If you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make.[\[10\]](https://www.wikihow.com/Solve-a-Sudoku#_note-10) X Research source - If you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle. - Recheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before. 2. [![Step 2 Retrace your steps.](https://www.wikihow.com/images/thumb/1/10/Solve-a-Sudoku-Step-11-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-11-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-11-Version-4.jpg) 2 Retrace your steps. It’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch.[\[11\]](https://www.wikihow.com/Solve-a-Sudoku#_note-11) X Research source 3. [![Step 3 Take a break.](https://www.wikihow.com/images/thumb/7/78/Solve-a-Sudoku-Step-12-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-12-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-12-Version-4.jpg) 3 Take a break. If you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier. 4. [![Step 4 Keep practicing.](https://www.wikihow.com/images/thumb/3/3e/Solve-a-Sudoku-Step-13-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-13-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-13-Version-2.jpg) 4 Keep practicing. Sudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you [get stuck](https://www.wikihow.com/Solve-Sudoku-when-Stuck "Solve Sudoku when Stuck"), don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help\![\[12\]](https://www.wikihow.com/Solve-a-Sudoku#_note-12)X [Expert Source](https://www.wikihow.com/wikiHow:Delivering-a-Trustworthy-Experience) [![Phil Yu](https://www.wikihow.com/images/thumb/4/48/Phil_Yu_.png/-crop-100-100-100px-Phil_Yu_.png)Phil Yu Rubik's Cube Expert](https://www.wikihow.com/Author/Phil-Yu) Expert Interview [\[13\]](https://www.wikihow.com/Solve-a-Sudoku#_note-13) X Research source Section 5 of 5: ### Does sudoku involve math? [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) 1. [![Sudoku is based on patterns, not math.](https://www.wikihow.com/images/thumb/e/e9/Solve-a-Sudoku-Step-14-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-14-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-14-Version-2.jpg) Sudoku is based on patterns, not math. While patterns are technically a part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way.[\[14\]](https://www.wikihow.com/Solve-a-Sudoku#_note-14) X Research source ### Sample Sudoku Puzzles [![](https://www.wikihow.com/images/thumb/8/8b/Easy-Sudoku.png/340px-Easy-Sudoku.png.webp)![](https://www.wikihow.com/images/thumb/8/8b/Easy-Sudoku.png/340px-Easy-Sudoku.png) Sample Easy Sudoku](https://www.wikihow.com/Sample/Easy-Sudoku) [![](https://www.wikihow.com/images/thumb/7/7c/Intermediate-Sudoku.png/340px-Intermediate-Sudoku.png.webp)![](https://www.wikihow.com/images/thumb/7/7c/Intermediate-Sudoku.png/340px-Intermediate-Sudoku.png) Sample Intermediate Sudoku](https://www.wikihow.com/Sample/Intermediate-Sudoku) [![](https://www.wikihow.com/images/thumb/1/10/Hard-Sudoku.png/340px-Hard-Sudoku.png.webp)![](https://www.wikihow.com/images/thumb/1/10/Hard-Sudoku.png/340px-Hard-Sudoku.png) Sample Hard Sudoku](https://www.wikihow.com/Sample/Hard-Sudoku) ### Blank Sudoku Template [![](https://www.wikihow.com/images/thumb/8/87/Blank-Sudoku.png/340px-Blank-Sudoku.png.webp)![](https://www.wikihow.com/images/thumb/8/87/Blank-Sudoku.png/340px-Blank-Sudoku.png) Blank Sudoku Template](https://www.wikihow.com/Sample/Blank-Sudoku) ## Community Q\&A Search [Add New Question]() - Question Are all sudoku puzzles solvable? ![Community Answer](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-104-104-104px-CommunityAvatar4.png) Community Answer Yes, unless the puzzle was printed with an error, which is unlikely. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \$1 helps us in our mission. [Support wikiHow](https://www.wikihow.com/wikiHow:Contribute) [Yes](https://www.wikihow.com/Solve-a-Sudoku) [No](https://www.wikihow.com/Solve-a-Sudoku) [Not Helpful 37](https://www.wikihow.com/Solve-a-Sudoku) [Helpful 83](https://www.wikihow.com/Solve-a-Sudoku) - Question When all of the squares are the correct numbers, can I assume the rows and columns are correct? ![Community Answer](https://www.wikihow.com/images/thumb/0/0a/CommunityAvatar1.png/-crop-104-104-104px-CommunityAvatar1.png) Community Answer The numbers in the 9 squares cannot be "correct," as you say, unless the rows and columns are also correct. You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \$1 helps us in our mission. [Support wikiHow](https://www.wikihow.com/wikiHow:Contribute) [Yes](https://www.wikihow.com/Solve-a-Sudoku) [No](https://www.wikihow.com/Solve-a-Sudoku) [Not Helpful 26](https://www.wikihow.com/Solve-a-Sudoku) [Helpful 64](https://www.wikihow.com/Solve-a-Sudoku) - Question Is there an easy way to play sudoku? ![Ellie](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-100-100-100px-CommunityAvatar4.png) Ellie Community Answer Once you get the hang of it, it will become pretty easy and fun. Thanks! We're glad this was helpful. Thank you for your feedback. If wikiHow has helped you, please consider a small contribution to support us in helping more readers like you. We’re committed to providing the world with free how-to resources, and even \$1 helps us in our mission. [Support wikiHow](https://www.wikihow.com/wikiHow:Contribute) [Yes](https://www.wikihow.com/Solve-a-Sudoku) [No](https://www.wikihow.com/Solve-a-Sudoku) [Not Helpful 55](https://www.wikihow.com/Solve-a-Sudoku) [Helpful 42](https://www.wikihow.com/Solve-a-Sudoku) [See more answers](https://www.wikihow.com/Questions/Solve-a-Sudoku#offset=3) Ask a Question 200 characters left Include your email address to get a message when this question is answered. [Submit]() Advertisement ## Video [Read Video Transcript](https://www.wikihow.com/Solve-a-Sudoku) ## Tips - It may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles\! Thanks [Helpful 3](https://www.wikihow.com/Solve-a-Sudoku) [Not Helpful 6](https://www.wikihow.com/Solve-a-Sudoku) Submit a Tip All tip submissions are carefully reviewed before being published Name Please provide your name and last initial [Submit](https://www.wikihow.com/Solve-a-Sudoku) Thanks for submitting a tip for review\! Advertisement ## Warnings - For every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle. 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[↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-1) <https://bestofsudoku.com/sudoku-strategy> 2. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-2) <https://www.pennydellpuzzles.com/wp-content/uploads/2019/03/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W> 3. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-3) <https://www.stolaf.edu/people/hansonr/sudoku/explain.htm> 4. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-4) <https://www.stolaf.edu/people/hansonr/sudoku/explain.htm> 5. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-5) <https://bestofsudoku.com/sudoku-strategy> 6. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-6) <https://www.pennydellpuzzles.com/wp-content/uploads/2019/03/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W> 7. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-7) <https://www.pennydellpuzzles.com/wp-content/uploads/2019/03/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W> 8. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-8) <https://www.pennydellpuzzles.com/wp-content/uploads/2019/03/How-to-Solve-Sudoku.pdf?srsltid=AfmBOopj-nLmLZYYVU8hNxbOQGtkvd9Z5cdU8lP70ikr5KDcc_P9kJ_W> 9. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-9) <https://www.sudoku.org.uk/SolvingTechniques/X-WingFamily.asp> [More References (5)](https://www.wikihow.com/Solve-a-Sudoku#aiinfo) 1. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-10) <https://bestofsudoku.com/sudoku-strategy> 2. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-11) <https://bestofsudoku.com/sudoku-strategy> 3. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-12) Phil Yu. Rubik's Cube Expert. Expert Interview 4. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-13) <https://sudoku.com/how-to-play/how-to-improve-your-sudoku-skills-in-5-minutes-or-less/> 5. [↑](https://www.wikihow.com/Solve-a-Sudoku#_ref-14) <https://bestofsudoku.com/sudoku-strategy> ## About This Article ![Juliana Pache](https://www.wikihow.com/images/thumb/9/9c/Juliana_Pache_.png/-crop-100-100-100px-Juliana_Pache_.png) Co-authored by: [Juliana Pache](https://www.wikihow.com/Author/Juliana-Pache) Crossword Puzzle Expert This article was co-authored by [Juliana Pache](https://www.wikihow.com/Author/Juliana-Pache) and by wikiHow staff writer, [Raven Minyard, BA](https://www.wikihow.com/Author/Raven-Minyard-BA). Juliana Pache is a puzzle maker based in Brooklyn, NY. Juliana is passionate about Black diasporic legacies and creates puzzles that engage with Black popular culture. She founded Black Crossword, the premier destination for word gamers interested in Black culture and the diaspora. Black Crossword launched in 2023 and offers a free daily mini puzzle, with plans to launch standard-size puzzles under a subscription. There is also a book available for purchase that contains 100 mini-puzzles within it. Juliana has a BS in Media Studies and Production from Temple University and has previously worked in marketing and media for companies like Rolling Stone, VICE, and The FADER. Juliana and Black Crossword have been featured in the New York Times, BET, the Huffington Post, and Good Morning America. This article has been viewed 2,736,252 times. 22 votes - 57% Co-authors: 110 Updated: February 19, 2026 Views: 2,736,252 Categories: [Featured Articles](https://www.wikihow.com/Category:Featured-Articles "Category:Featured Articles") \\| [Mathematical Puzzles](https://www.wikihow.com/Category:Mathematical-Puzzles "Category:Mathematical Puzzles") [Article SummaryX](https://www.wikihow.com/Solve-a-Sudoku#summary_wrapper) Sudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game! To learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on\! Did this summary help you? 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I always secretly admired his attention to the game and his apparent success. It looked too difficult for me. However, I am holding my own with him after reading the strategic steps and tips. Thank you."..." [more](https://www.wikihow.com/Solve-a-Sudoku) [More reader stories](https://www.wikihow.com/Solve-a-Sudoku) [Hide reader stories](https://www.wikihow.com/Solve-a-Sudoku) [Share your story](https://www.wikihow.com/Solve-a-Sudoku) ## Did this article help you? Yes No [![](https://www.wikihow.com/images/d/d7/Tech_v15_0728x0180%402x.jpg)![](https://www.wikihow.com/images/d/d7/Tech_v15_0728x0180%402x.jpg)](https://www.wikihow.com/Tech-Help-Pro?utm_source=wikihow&utm_medium=bottom&utm_campaign=techhelppro_tech_v15) Advertisement Cookies make wikiHow better. By continuing to use our site, you agree to our [cookie policy](https://www.wikihow.com/wikiHow:Cookie-Policy). ![Juliana Pache](https://www.wikihow.com/images/thumb/9/9c/Juliana_Pache_.png/-crop-100-100-100px-Juliana_Pache_.png) Co-authored by: [Juliana Pache](https://www.wikihow.com/Author/Juliana-Pache) Crossword Puzzle Expert 22 votes - 57% Click a star to vote Co-authors: 110 Updated: February 19, 2026 Views: 2,736,252 ![Janet Clark](https://www.wikihow.com/images/thumb/0/0a/CommunityAvatar1.png/-crop-72-72-72px-CommunityAvatar1.png) Janet Clark Jun 25, 2018 "My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It looked too difficult for me. However, I am holding my own with him after reading the strategic steps and tips. Thank you."..." [more](https://www.wikihow.com/Solve-a-Sudoku) ![Neill Conroy](https://www.wikihow.com/images/thumb/0/0a/CommunityAvatar1.png/-crop-72-72-72px-CommunityAvatar1.png) Neill Conroy Jun 6, 2016 "Highlighting all the ones by drawing lines in their row and column makes a huge difference. Also, using dots in a grid instead of writing the actual number saves a lot of confusion, as long as you are very neat and VERY careful!"..." [more](https://www.wikihow.com/Solve-a-Sudoku) ![Anonymous](https://www.wikihow.com/images/thumb/0/0a/CommunityAvatar1.png/-crop-72-72-72px-CommunityAvatar1.png) Anonymous Oct 29, 2017 "Starting out with the basics helped. I had no idea what to do to start. I also didn't know that there were 9 smaller squares that required 1-9. I started off doing long rows until I read your article."..." [more](https://www.wikihow.com/Solve-a-Sudoku) ![Trevor Morgan](https://www.wikihow.com/images/thumb/b/b0/CommunityAvatar2.png/-crop-72-72-72px-CommunityAvatar2.png) Trevor Morgan Sep 26, 2016 "Putting the possible numbers in a square in pencil was the best help. I can solve easy and medium puzzles now, fantastic."..." [more](https://www.wikihow.com/Solve-a-Sudoku) ![NANDKUMAR A.](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-72-72-72px-CommunityAvatar4.png) NANDKUMAR A. Apr 3, 2024 "After many searches I found this quite clear with examples." 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Readable Markdown	[![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) Try these simple strategies to improve your sudoku skills [![PDF download](https://www.wikihow.com/extensions/wikihow/socialstamp/images/icon-pdf.svg) Download Article](https://www.wikihow.com/Solve-a-Sudoku) - [Sudoku Rules & Layout](https://www.wikihow.com/Solve-a-Sudoku#Sudoku-Rules-.26-Layout) - [Using the Scanning Strategy](https://www.wikihow.com/Solve-a-Sudoku#Using-the-Scanning-Strategy) - [Filling in Candidates](https://www.wikihow.com/Solve-a-Sudoku#Filling-in-Candidates) - [Fixing Mistakes](https://www.wikihow.com/Solve-a-Sudoku#Fixing-Mistakes-.26-Getting-Unstuck) - [Does sudoku involve math?](https://www.wikihow.com/Solve-a-Sudoku#Does-sudoku-involve-math.3F) - [Video](https://www.wikihow.com/Solve-a-Sudoku#Video) - [Q\&A](https://www.wikihow.com/Solve-a-Sudoku#qa_headline) Sudoku puzzles may seem intimidating at first, but with a bit of practice, they’re pretty easy to solve. These puzzles don’t actually involve math (thankfully). Instead, they’re all about pattern recognition. In this article, we’ll teach you everything you need to know to solve a sudoku puzzle, from learning the basic rules and setup to trying different techniques like scanning the puzzle for answers and filling in candidates. Plus, learn how to fix mistakes and get unstuck during tough puzzles. ## Solving a Sudoku: Quick Tips Start by identifying a single empty cell within a row, column, or block and filling in the missing number. Write down all potential answers to each square and fill in any cells that only have one candidate. Also look for numbers repeated twice within a row of 3 blocks—if you find the same number in two blocks, you know that same number goes somewhere in the third block of that row. 1. [![Step 1 Sudoku is played on a 9x9 grid of squares.](https://www.wikihow.com/images/thumb/7/7b/Solve-a-Sudoku-Step-1-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-1-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-1-Version-2.jpg) A sudoku grid consists of a square grid of 9 large squares, often called blocks. Within each of those blocks will be 9 smaller squares. Some of those squares will be filled with numbers from 1 to 9. Easier puzzles will have more numbers filled in, while more difficult puzzles will have fewer squares filled.[\[1\]](https://www.wikihow.com/Solve-a-Sudoku#_note-1) - The larger squares are often outlined with a darker line, while the smaller squares have a thinner line. Additionally, sometimes the larger squares will be colored in a checkerboard pattern. 2. [![Step 2 Fill the remaining numbers in, making sure they don’t repeat.](https://www.wikihow.com/images/thumb/0/09/Solve-a-Sudoku-Step-2-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-2-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-2-Version-3.jpg) Each row, column, and block should contain all of the numbers from 1 to 9. That means that within a row, column, or block, a number cannot repeat. Your job is to figure out where each number goes to complete the puzzle.[\[2\]](https://www.wikihow.com/Solve-a-Sudoku#_note-2) - For example, if a block (large square) already has the number “2” in it, you know it can’t include another “2” anywhere in the square. - Similarly, if a column already has a “3,” it can’t have another “3,” even if it’s in a different block. - It’s better to use a pencil rather than a pen when solving sudoku. This way, you can erase any mistakes you make and keep your board clean. Remember to write lightly so you can erase better. 1. [![Step 1 Look for a single empty cell in a block, column, or row.](https://www.wikihow.com/images/thumb/c/c6/Solve-a-Sudoku-Step-3-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-3-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-3-Version-3.jpg) Examine each large block to see if it has a single square open. Or, run your finger down each row and column to see if they have one empty, as well. These single empty squares are called “naked singles.” They’re easy to fill in because you just have to figure out which number is missing from 1 to 9.[\[3\]](https://www.wikihow.com/Solve-a-Sudoku#_note-3) - For example, if a block has the numbers 1-3 and 5-9, you know it’s missing the number “4,” which you can fill in. - Or, if a column has numbers 1-7 and 9, you know it’s missing the number “8.” - This is one of the easiest strategies to use, especially when just starting the puzzle. 2. [![Step 2 Scan rows or columns to fill in blocks.](https://www.wikihow.com/images/thumb/c/c8/Solve-a-Sudoku-Step-4-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-4-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-4-Version-2.jpg) Look at a row of 3 blocks and check for a number that’s repeated 2 times in different blocks. Run your fingers along the rows (or columns) that contain that number. The third block must contain the same number, but it can’t be in either of the rows you’re tracing; it must be in the third row. Sometimes, 2 other numbers will be in that row, so you can easily fill in the number you’re scanning.[\[4\]](https://www.wikihow.com/Solve-a-Sudoku#_note-4) - For example, if “8” is repeated in 2 blocks, look for that number in the third block. Run your finger down the rows with each “8,” as you know the “8” can’t be in either of those rows in the third block. - Once you get the hang of scanning across just rows or columns, add the other direction as well. 3. [![Step 3 Work in groups of numbers.](https://www.wikihow.com/images/thumb/d/d1/Solve-a-Sudoku-Step-5-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-5-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-5-Version-3.jpg) That is, if you see that you have a lot of one number on the board, it can help to start trying to fill in the rest of that number. For example, say you have a large number of 5s on the board. Use your scanning techniques to fill in as many 5s as you can. This still requires you to examine blocks, rows, and columns to make sure they don’t repeat.[\[5\]](https://www.wikihow.com/Solve-a-Sudoku#_note-5) - Another option is to include 3 blocks in a row or column in your analysis. Pick 1 number, and see if you can place it across all 3 squares. For instance, take the number "6." See which rows and columns already have 6s, and use that to scan across to the 3 blocks you're looking at. Based on that information and what you have in the squares, try to place as many of the 6s as you can. 1. [![Step 1 Write down all “candidates” for a square.](https://www.wikihow.com/images/thumb/f/fb/Solve-a-Sudoku-Step-6-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-6-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-6-Version-3.jpg) A candidate is any number that could belong in a certain square. Pencil in all possible entries for each square. Then, check to see if any squares contain only one possible answer. This is a “forced” entry that you can fill in.[\[6\]](https://www.wikihow.com/Solve-a-Sudoku#_note-6) 2. [![Step 2 Look for “naked pairs.”](https://www.wikihow.com/images/thumb/f/f9/Solve-a-Sudoku-Step-7-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-7-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-7-Version-3.jpg) A naked pair (sometimes called a conjugate pair) is a set of two candidates that could go in two different squares within a block, row, or column. Because you know these numbers must go in one of these squares, eliminate them as candidates in other squares in that block, column, or row.[\[7\]](https://www.wikihow.com/Solve-a-Sudoku#_note-7) - For example, let’s say you’ve marked all the candidates within a block and you notice the numbers “2” and “8” are the only two candidates that could go in two different squares. These are your naked pairs, so they cannot go in any other square within the block except the two you’ve marked. 3. [![Step 3 Eliminate squares using hidden pairs.](https://www.wikihow.com/images/thumb/7/78/Solve-a-Sudoku-Step-8-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-8-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-8-Version-3.jpg) Hidden pairs are similar to naked pairs, in that they are two numbers that can only go in two cells within a block, row, or column. However, these cells also contain at least one other candidate, which is what makes them “hidden.” Carefully examine the candidates in each of your squares to find two that contain the same two numbers.[\[8\]](https://www.wikihow.com/Solve-a-Sudoku#_note-8) - For example, let’s say one cell within a block contains the candidates 1, 4, and 7. Another cell contains the numbers 1, 8, and 7. Because they both contain 1 and 7, this is your hidden pair. Eliminate the numbers 1 and 7 from all other cells within the block. 4. [![Step 4 Try the X-wing technique on difficult puzzles.](https://www.wikihow.com/images/thumb/8/84/Solve-a-Sudoku-Step-9-Version-3.jpg/v4-460px-Solve-a-Sudoku-Step-9-Version-3.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-9-Version-3.jpg) An X-wing is an advanced technique used to remove candidates in [difficult puzzles](https://www.wikihow.com/Solve-Hard-Sudoku-Puzzles "Solve Hard Sudoku Puzzles"). First, look for a row that contains the same candidate in two different spots. Then, find a parallel row that mirrors it and contains the same candidates in the same spots. This allows you to remove those candidates from the columns that contain those cells.[\[9\]](https://www.wikihow.com/Solve-a-Sudoku#_note-9) - For example, let’s say the first row of the grid contains a 4 as a candidate in the 2nd and 5th squares. The third row of the grid also contains a 4 in the 2nd and 5th squares. This allows you to erase the 4 as a candidate in all other squares in the 2nd and 5th columns, because it must go in either the first or third row. 1. [![Step 1 Avoid guessing.](https://www.wikihow.com/images/thumb/8/89/Solve-a-Sudoku-Step-10-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-10-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-10-Version-4.jpg) If you’ve narrowed a cell down to one or two candidates, you may be tempted to pick one at random. This may result in getting a few more “answers,” but at some point, you’ll likely realize the puzzle is now impossible to solve—often toward the end of the game. To avoid putting in a lot of hard work for nothing, make sure you’re confident about each choice you make.[\[10\]](https://www.wikihow.com/Solve-a-Sudoku#_note-10) - If you’re stumped by a certain cell, it’s okay to come back to it later. There may be an easier solution somewhere else in the puzzle. - Recheck the puzzle often. As you fill in numbers, you may be able to figure out the answers to spaces you had to leave blank before. 2. [![Step 2 Retrace your steps.](https://www.wikihow.com/images/thumb/1/10/Solve-a-Sudoku-Step-11-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-11-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-11-Version-4.jpg) It’s a good idea to do sudoku puzzles in pencil because, odds are, you’ll need to do some erasing at some point. If you realize you made a mistake, try to retrace the last few steps you made. Pay attention to each number to try to determine which one is incorrect. If you can’t find the mistake, it may be easier to start from scratch.[\[11\]](https://www.wikihow.com/Solve-a-Sudoku#_note-11) 3. [![Step 3 Take a break.](https://www.wikihow.com/images/thumb/7/78/Solve-a-Sudoku-Step-12-Version-4.jpg/v4-460px-Solve-a-Sudoku-Step-12-Version-4.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-12-Version-4.jpg) If you can’t figure out what to do next, set the puzzle down and take a break. Take some deep breaths or go for a short walk. If you’re frustrated, it will be harder to find the patterns you’re looking for, so return to the puzzle once your brain has had time to relax. You may be able to figure out some answers you couldn’t see earlier. 4. [![Step 4 Keep practicing.](https://www.wikihow.com/images/thumb/3/3e/Solve-a-Sudoku-Step-13-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-13-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-13-Version-2.jpg) Sudoku is a game of pattern recognition, which is a skill learned over time. It’s okay to make mistakes, especially if you’re just learning how to play. If you [get stuck](https://www.wikihow.com/Solve-Sudoku-when-Stuck "Solve Sudoku when Stuck"), don’t get discouraged. Keep trying different puzzles and different techniques until you get the hang of it. Even practicing as little as 5 minutes a day can help\![\[12\]](https://www.wikihow.com/Solve-a-Sudoku#_note-12) [\[13\]](https://www.wikihow.com/Solve-a-Sudoku#_note-13) 1. [![Sudoku is based on patterns, not math.](https://www.wikihow.com/images/thumb/e/e9/Solve-a-Sudoku-Step-14-Version-2.jpg/v4-460px-Solve-a-Sudoku-Step-14-Version-2.jpg)](https://www.wikihow.com/Solve-a-Sudoku#/Image:Solve-a-Sudoku-Step-14-Version-2.jpg) While patterns are technically a part of math, solving a sudoku puzzle does not use math as we typically think of it (like adding and subtracting). The use of numbers can be intimidating, but they could actually be replaced with other symbols, like letters or shapes. The game would still be played the same way.[\[14\]](https://www.wikihow.com/Solve-a-Sudoku#_note-14) ### Sample Sudoku Puzzles ### Blank Sudoku Template Search [Add New Question]() - Question Are all sudoku puzzles solvable? ![Community Answer](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-104-104-104px-CommunityAvatar4.png) Community Answer Yes, unless the puzzle was printed with an error, which is unlikely. - Question When all of the squares are the correct numbers, can I assume the rows and columns are correct? ![Community Answer](https://www.wikihow.com/images/thumb/0/0a/CommunityAvatar1.png/-crop-104-104-104px-CommunityAvatar1.png) Community Answer The numbers in the 9 squares cannot be "correct," as you say, unless the rows and columns are also correct. You can have all 9 squares with all 9 numbers, but that does not guarantee that the rows and columns will be correct. - Question Is there an easy way to play sudoku? ![Ellie](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-100-100-100px-CommunityAvatar4.png) Ellie Community Answer Once you get the hang of it, it will become pretty easy and fun. [See more answers](https://www.wikihow.com/Questions/Solve-a-Sudoku#offset=3) Ask a Question 200 characters left Include your email address to get a message when this question is answered. [Submit]() Advertisement - It may be easier to start with online sudoku puzzles! Many websites let you choose the difficulty level, so stick with “beginner” or “easy” puzzles until you get the hang of it. Then, challenge yourself with more difficult puzzles\! Thanks Thanks for submitting a tip for review\! Advertisement - For every cell you fill in, make sure you double-check your logic; a single error could mess up the entire puzzle. Thanks Advertisement ## References About This Article [Article SummaryX](https://www.wikihow.com/Solve-a-Sudoku#summary_wrapper) Sudoku is a game played on a 9 x 9 grid where the object of the game is to fill every space with the correct number. The grid is divided into 9 separate 3 x 3 squares. To complete the grid, every column, row and square (each containing 9 spaces) needs to be filled in with the numbers 1-9 without repeating any numbers within the row, column or square. Some squares already have numbers filled in, so begin by look for missing numbers in a row, column or square. For example, if a square already has 7 out of the 9 spaces filled in, you can figure out which 2 numbers are missing and use the numbers in the correlating rows and columns to determine which of the two missing numbers belongs in each space. If you see a single empty space in a larger square, fill that in first. Then look for single empty squares in each row and column that you can fill in. Next, you can start scanning each row for a certain number, like 1, to see where it should go. Every Sudoku has one solution, so double check by making sure each column, row and square contains the numbers 1-9 with no duplicates or omissions. Continue using logic and deduction until you have filled in all of the empty squares. Once you have filled in all of the squares with the correct numbers, you win the game! To learn how to do more advanced sudoku techniques, like adding up the rows and columns, read on\! Did this summary help you? Thanks to all authors for creating a page that has been read 2,736,252 times. Reader Success Stories - ![Janet Clark](https://www.wikihow.com/images/thumb/f/f5/CommunityAvatar4.png/-crop-72-72-72px-CommunityAvatar4.png) Janet Clark Jun 25, 2018 "My husband was a Sudoku nut. I always secretly admired his attention to the game and his apparent success. It..." [more](https://www.wikihow.com/Solve-a-Sudoku) ## Did this article help you?
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