---
title: "Find the Mistake Level Up #6: 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 #6: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-6/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #6
Level Up
# Level Up #6
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/PaF7RxF5lD0)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #6 · Level 1 · 4×4:
```text
1 2* | . 4
3* 4 | . 1*
------+------
4* 1* | . .
. 3 | 4 1
```
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 2, column 4. Column 4 already has a printed 1 (row 4, column 4). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 2.
## Level 2 · 6×6
Tap the digit you think is wrong.
Level Up #6 · Level 2 · 6×6:
```text
5 1 3 | . . 1*
2* 6 4 | 3 5 .
---------+---------
4 2 6 | 1 . 5
1* 3* . | 4 2* 6
---------+---------
. 4* 2* | . 1 .
3* . 1* | 6* 4* .
```
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 1, column 6. Row 1 already has a printed 1 (row 1, column 2). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 4.
## Level 3 · 9×9
Tap the digit you think is wrong.
Level Up #6 · Level 3 · 9×9:
```text
. 6 3 | 8 5 4 | 2 . .
. 5* 4 | 7 2* 1* | . 6 3
2* . 1* | 9 6 3* | . 5 .
---------+----------+---------
6* 3* 8 | 2 1 9* | 5* 4* 7
4* 1 9* | 5* 7* 8 | 1* 3 2
5* 2 7 | 4 3* 6 | . 9 .
---------+----------+---------
. . 6* | 1 8* . | 4 2 .
. . 5* | 6 4 2 | . . .
. . 2 | 3* 9 . | . 8 6
```
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 7. Row 5 already has a printed 1 (row 5, column 2). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 6.
## 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.