---
title: "Find the Mistake Level Up #3: 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 #3: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-3/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #3
Level Up
# Level Up #3
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/bC6acnu3Ags)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #3 · Level 1 · 4×4:
```text
4* 3 | 1* .
1 2* | . 4
------+------
3 . | 2* 3*
2 1 | . .
```
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 3, column 4. Row 3 already has a printed 3 (row 3, 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 #3 · Level 2 · 6×6:
```text
5* 4 6* | 2 3 1
1 . . | 4* 5* .
---------+---------
3 6 4* | 1 2* .
2 . 5 | 3* . 4
---------+---------
4* 5* 2 | . 3* .
6 3 1 | . . 2*
```
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 5, column 5. Column 5 already has a printed 3 (row 1, column 5). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## Level 3 · 9×9
Tap the digit you think is wrong.
Level Up #3 · Level 3 · 9×9:
```text
2* . 7 | . . 5* | 4 . .
3 5 8* | 1 6* 4* | 2* 9 7
. . 6 | . 2 7* | . 5 .
---------+----------+---------
. 2 5* | . . 3 | . . .
. . 4* | 2 5 9* | . 8 .
8 3 1 | 7* 4 6 | 9 2 5
---------+----------+---------
5 7 2 | 4 1* 8 | 6 3* 9*
1* 8* 3* | 6* 7 9 | 5 4 2
6* 4 9* | 5* 3 2* | . . .
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 9 in row 5, column 6. Column 6 already has a printed 9 (row 8, column 6). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## 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.