---
title: "Find the Mistake Level Up #5: 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 #5: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-5/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #5
Level Up
# Level Up #5
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/b4drudcwORA)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #5 · Level 1 · 4×4:
```text
1 2* | . 3*
. 4* | 2 .
------+------
4 3 | 1* .
2 . | 3 2*
```
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 4. Row 4 already has a printed 2 (row 4, column 1). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 4.
## Level 2 · 6×6
Tap the digit you think is wrong.
Level Up #5 · Level 2 · 6×6:
```text
5 4* 1* | . . .
. 3 6 | . 1* 5
---------+---------
. 6 5* | . 3* 4
. 4 . | 5* 2 6*
---------+---------
6 1 4* | . 5 2
3* 5* 2 | 6 4 1*
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 4 in row 1, column 2. Column 2 already has a printed 4 (row 4, column 2). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 2.
## Level 3 · 9×9
Tap the digit you think is wrong.
Level Up #5 · Level 3 · 9×9:
```text
8 6 5* | 7* 3 4 | . 1 .
3* 7 4 | 1* 2 9 | 8 6* 5
9 1* 2* | 6* 8 5 | 3 . .
---------+----------+---------
6* 8 9* | 3* . 2* | 5* . .
7 4 3 | 9* 5 1* | 6 2* 8
5 2 1 | 8* . 6 | . 3 .
---------+----------+---------
4 . 8 | . . 3 | 1 . .
1 . 7* | 4 . 9* | . 5 .
2* . 6* | . 1 7* | . 8 .
```
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 8, column 6. Column 6 already has a printed 9 (row 2, column 6). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 8.
## 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.