---
title: "Find the Mistake Level Up #12: 3 Sudoku Levels | Sudoku Flow"
description: "Three Sudoku boards, one wrong number in each: a 4×4, a 6×6, then a full 9×9. Level Up #12: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-12/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #12
Level Up
# Level Up #12
Three boards, each with one wrong number, from a small 4×4 to a full 9×9. Play every level here, at your own pace.
[Watch on YouTube](https://youtube.com/shorts/kAWJVXepYqE)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #12 · Level 1 · 4×4:
```text
4 3 | 2* 1
2 . | . .
------+------
3* 4 | . 2*
2* . | 4 3*
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 2 in row 4, column 1. Column 1 already has a printed 2 (row 2, column 1). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## Level 2 · 6×6
Tap the digit you think is wrong.
Level Up #12 · Level 2 · 6×6:
```text
5 1 4 | . 6* 2*
. 2 3 | 5 4 .
---------+---------
2 3* 5* | 6* 1 .
. 6* . | 2 5 .
---------+---------
1 5* 2 | . 3* 1*
3* 4 . | . 2* 5
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 1 in row 5, column 6. Row 5 already has a printed 1 (row 5, column 1). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 6.
## Level 3 · 9×9
Tap the digit you think is wrong.
Level Up #12 · Level 3 · 9×9:
```text
. 5* . | 7* . 2 | 6 8 .
. 2* 7 | 6 . 8* | . . .
6 8* . | 3 5 1 | . . 7
---------+----------+---------
5 1 . | 2 7* 3* | . 4 .
2* 4 . | 9* 6 5* | 1 7 .
7 3* . | 8 1* 4 | . . 2
---------+----------+---------
1 9 3* | 5* 2* 7 | 4 6 8*
8 7 5* | 4* 3 6 | . . .
4 6 2 | 1* 8 9* | 2* 3* 5
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 2 in row 9, column 7. Row 9 already has a printed 2 (row 9, column 3). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 7.
## 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.