--- title: "Play Sudoku Online Free, No Ads | Sudoku Flow" description: "Play Sudoku online for free with no ads: six levels from Easy to Extreme, with notes, undo and hints. Plus a Daily Sudoku and printable puzzles." url: https://sudokuflow.com/ language: en --- # Play Sudoku online, free and without ads Pick a level and start. Every puzzle has one answer and comes from the graded bank of our Sudoku app: Easy needs only singles, Extreme the hardest patterns. ## Easy · #1 Daily Sudoku grid: ```text 3 6 . | . 1 7 | 8 . . . . 8 | . . 3 | . 4 . 1 2 . | . 6 4 | 3 9 7 ------+-------+------ . 3 7 | 4 9 5 | 1 . 2 . 9 . | 3 8 1 | 7 5 . 8 . 1 | . 7 2 | 4 3 9 ------+-------+------ 7 . 3 | 1 . 9 | . . 8 . 1 6 | . . . | . 7 . 5 . 9 | 7 4 6 | 2 1 3 ```
What does this puzzle need?
## All six levels - [Easy Sudoku](https://sudokuflow.com/play/easy/) Nearly Complete (95%) - [Medium Sudoku](https://sudokuflow.com/play/medium/) Hidden Single (100%) - [Hard Sudoku](https://sudokuflow.com/play/hard/) Pointing Pair (60%), Naked Pair (18%), Box/Line Reduction (13%), or Hidden Pair (6%) - [Expert Sudoku](https://sudokuflow.com/play/expert/) Skyscraper (55%), Y-Wing (30%), or Empty Rectangle (6%) - [Master Sudoku](https://sudokuflow.com/play/master/) XY-Chain (59%), W-Wing (28%), X-Chain (6%), or XYZ-Wing (5%) - [Extreme Sudoku](https://sudokuflow.com/play/extreme/) ALS-XZ (86%) or Unique Rectangle (12%) [What each Sudoku difficulty level asks of you →](https://sudokuflow.com/data/sudoku-difficulty-levels/) A new puzzle every day ## Spot it. Solve it. See why. Short Sudoku puzzles that take a few seconds to try. Every answer is proved on the board, cell by cell, so you can check it with your own eyes. [Play today's Sudoku](https://sudokuflow.com/daily/) [Today's puzzle](https://sudokuflow.com/puzzles/find-the-mistake-21/) [Watch on YouTube](https://www.youtube.com/@sudokuflowdaily) [![Find the mistake #21: a half-finished Sudoku board with one wrong digit](https://sudokuflow.com/media/puzzles/find-the-mistake-21-en.jpg?v=15f9ef203b)](https://sudokuflow.com/puzzles/find-the-mistake-21/) ## How it works 1. ### Watch A short video shows a board with one thing to find. You have five seconds. 2. ### Find it Spot it before the timer runs out, or play the same board on its page. 3. ### See why The answer is proved on the board, cell by cell, so you can check it yourself. - A new puzzle every day - Japanese and English - Free, no sign-up ## Latest puzzles [See all puzzles →](https://sudokuflow.com/puzzles/) [![Find the mistake #21](https://sudokuflow.com/media/puzzles/find-the-mistake-21-en.jpg?v=15f9ef203b)](https://sudokuflow.com/puzzles/find-the-mistake-21/): Find the mistake #21 11 s video [![Mistake Rush #19](https://sudokuflow.com/media/puzzles/mistake-rush-19-en.jpg?v=31c3992d46)](https://sudokuflow.com/puzzles/mistake-rush-19/): Mistake Rush #19 23 s video [![Mistake Rush #18](https://sudokuflow.com/media/puzzles/mistake-rush-18-en.jpg?v=dc0672465e)](https://sudokuflow.com/puzzles/mistake-rush-18/): Mistake Rush #18 23 s video [![Level Up #18](https://sudokuflow.com/media/puzzles/level-up-18-en.jpg?v=35315a15ff)](https://sudokuflow.com/puzzles/level-up-18/): Level Up #18 22 s video [![Find the mistake #20](https://sudokuflow.com/media/puzzles/find-the-mistake-20-en.jpg?v=8bf1a3eb1d)](https://sudokuflow.com/puzzles/find-the-mistake-20/): Find the mistake #20 11 s video [![Level Up #17](https://sudokuflow.com/media/puzzles/level-up-17-en.jpg?v=830b06bb76)](https://sudokuflow.com/puzzles/level-up-17/): Level Up #17 22 s video [![Find the mistake #19](https://sudokuflow.com/media/puzzles/find-the-mistake-19-en.jpg?v=84b0a41e57)](https://sudokuflow.com/puzzles/find-the-mistake-19/): Find the mistake #19 11 s video [![Mistake Rush #17](https://sudokuflow.com/media/puzzles/mistake-rush-17-en.jpg?v=ea3166abfc)](https://sudokuflow.com/puzzles/mistake-rush-17/): Mistake Rush #17 23 s video ## Latest lessons [See all lessons →](https://sudokuflow.com/lessons/) [![3D Medusa](https://sudokuflow.com/media/lessons/medusa3d-en.jpg?v=84c4bca90b)](https://sudokuflow.com/lessons/medusa3d/): 3D Medusa 49 s video [![Sue de Coq](https://sudokuflow.com/media/lessons/sueDeCoq-en.jpg?v=a7efe5c424)](https://sudokuflow.com/lessons/sueDeCoq/): Sue de Coq 65 s video [![ALS-XY-Wing](https://sudokuflow.com/media/lessons/alsXYWing-en.jpg?v=33188fc104)](https://sudokuflow.com/lessons/alsXYWing/): ALS-XY-Wing 91 s video [![ALS-XZ](https://sudokuflow.com/media/lessons/alsXZ-en.jpg?v=bef39983f8)](https://sudokuflow.com/lessons/alsXZ/): ALS-XZ 79 s video ## Find the Mistake Sudoku Find the Mistake is a quick Sudoku puzzle: a half-finished board where one digit breaks the rules. You get five seconds to spot it before the answer is shown on the board. [How to play →](https://sudokuflow.com/find-the-mistake/) [Sudoku checker →](https://sudokuflow.com/tools/sudoku-checker/) ## Learn the techniques Sudoku is solved with named techniques, from the first single to X-Wings and chains. Our app's site has the full library, with a worked example for each one. [Sudoku guides →](https://sudokuflow.com/guides/) [Open the technique library →](https://sudoku.rubigogames.com/sudoku-techniques.html) [What each Sudoku difficulty level asks of you →](https://sudokuflow.com/data/sudoku-difficulty-levels/) ## Sudoku for kids [See the sheets →](https://sudokuflow.com/printables/kids/) Printable 4×4 and 6×6 sheets with answers. [4×4 Sudoku 1: ```text 2 . | 3 4 4 . | 1 . ----+---- 1 2 | . . . . | . 1 ```](https://sudokuflow.com/printables/kids/4x4/): 4×4 Sudoku for Kids: Printable Sheets Every row, column and 2×2 box needs 1, 2, 3 and 4. See the sheets → [6×6 Sudoku 1: ```text 1 3 . | 5 . 6 . 4 . | . 1 3 ------+------ 6 1 . | 4 . 2 . . . | . 5 . ------+------ 4 6 . | . 2 . 2 . . | 3 6 . ```](https://sudokuflow.com/printables/kids/6x6/): 6×6 Sudoku for Kids: Printable Sheets Every row, column and 2×3 box needs 1 to 6. See the sheets → [Picture Sudoku 1: ```text . 2 | 3 . 3 1 | 4 . ----+---- . . | . 3 1 3 | . . ```](https://sudokuflow.com/printables/kids/picture/): Picture Sudoku for Kids: Printable Sheets Every row, column and 2×2 box needs one of each shape. See the sheets → [Christmas Sudoku 1: ```text . 2 | 3 . 3 1 | 4 . ----+---- . . | . 3 1 3 | . . ```](https://sudokuflow.com/printables/kids/christmas/): Christmas Sudoku for Kids: Printable Picture Puzzles Every row, column and 2×2 box needs one bauble, one tree, one present and one star. See the sheets → ![Sudoku app icon](https://sudokuflow.com/assets/app-icon.png) ## Want more boards like this? We also make a Sudoku app for iPhone, iPad, Mac and Android. There are no ads in it at all, it works offline, and when you ask for a hint it shows you the technique instead of just filling in a number. [App Store iPhone, iPad, Mac](https://apps.apple.com/app/apple-store/id6502922368?pt=125379530&ct=sudokuflow_web&mt=8) [Google Play Android](https://play.google.com/store/apps/details?id=com.rubigogames.sudoku&referrer=utm_source%3Dsudokuflow%26utm_medium%3Dweb%26utm_campaign%3Dsite) Sudoku Flow is made by Rubigo Games, the developer of the Sudoku app recommended on this site.