--- title: "Find the Mistake Sudoku #28 | Sudoku Flow" description: "Sudoku puzzle #28: a half-finished board with 58 digits, 32 of them filled in by a player, and one of those is wrong. Find it in five seconds, then check the answer." url: https://sudokuflow.com/puzzles/find-the-mistake-28/ language: en --- [Puzzles](https://sudokuflow.com/puzzles/) / Find the mistake #28 [Find the mistake](https://sudokuflow.com/find-the-mistake/) # Find the mistake #28 One digit on this board breaks the rules. The game is half finished: some digits were printed with the puzzle, the others were filled in by a player. Give yourself five seconds before the video shows it. ## Reading the board ## Where to start This board has 58 digits and 32 of them are blue, so those 32 are the only suspects. The most crowded line is row 1, with 9 digits: a good place to start. [How to find a mistake in Sudoku →](https://sudokuflow.com/guides/find-a-mistake/) ## Try it here Tap the digit you think is wrong. Sudoku board for Find the mistake #28: ```text 3 9* 4 | 2* 1 7* | 3* 5* 8* 2* . . | 3* 5* 8 | 9 4* 7 7 5* 8* | 9* 4 6 | . 2 . ---------+----------+--------- 4* . 2 | 6* 8* 9 | . . 5* 9* 7 . | 5 2* 4* | 8 . . 6 8* 5 | 1* 7* 3* | 4 9 2* ---------+----------+--------- 1 . . | 7 . 2* | 5 8 . 5 2 . | 8* 3 1* | 7* . . 8* . . | 4* . 5* | . . . ``` Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer It's the blue 3 in row 1, column 7. Row 1 already has a printed 3 (row 1, column 1). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 6.
Video transcript **On screen:** One number is wrong. / How fast did you find it? **Voice:** One number is wrong! Three! Two! One! Right there! How fast did you find it?
How fast did you find it? Tell us under the video. [Watch on YouTube](https://youtube.com/shorts/yO9JOSjpM1k)
Embed this puzzle Copy this code to show the puzzle on your own site or blog. It links back here.
## More puzzles [![Find the mistake #27](https://sudokuflow.com/media/puzzles/find-the-mistake-27-en.jpg?v=4fe4cbacee)](https://sudokuflow.com/puzzles/find-the-mistake-27/): Find the mistake #27 11 s video [![Find the mistake #26](https://sudokuflow.com/media/puzzles/find-the-mistake-26-en.jpg?v=6a981a11e3)](https://sudokuflow.com/puzzles/find-the-mistake-26/): Find the mistake #26 11 s video [![Find the mistake #25](https://sudokuflow.com/media/puzzles/find-the-mistake-25-en.jpg?v=ce623fdd25)](https://sudokuflow.com/puzzles/find-the-mistake-25/): Find the mistake #25 11 s video [![Find the mistake #24](https://sudokuflow.com/media/puzzles/find-the-mistake-24-en.jpg?v=584488d239)](https://sudokuflow.com/puzzles/find-the-mistake-24/): Find the mistake #24 11 s video ![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.