---
title: "Find the Mistake Level Up #9: 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 #9: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-9/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #9
Level Up
# Level Up #9
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/uDcEV4kkpYA)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #9 · Level 1 · 4×4:
```text
. 3* | 4* 2
. . | 1* 3
------+------
4 1* | 3 1
. . | 2* 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 3, column 2. Row 3 already has a printed 1 (row 3, 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 #9 · Level 2 · 6×6:
```text
4* 5* 6* | 3* 2 1
. 2 . | 6* 5 .
---------+---------
2* 6* . | 1* . 5
5 3* . | . 6 4*
---------+---------
6 4 2 | 5 . .
3 1 5 | 6 . 2*
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 6 in row 2, column 4. Column 4 already has a printed 6 (row 6, column 4). 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 #9 · Level 3 · 9×9:
```text
2 8* 3* | 1 5 4* | 6* 9 7*
. . . | 6* 9 7 | 2 8* 3
6 9* 7* | 8* 3* 2* | 1 4* 5
---------+----------+---------
3 2 . | 7* 1 8 | . . 6*
8 1 9* | 5 6* 3 | 4* 7 2
. . 6 | 2* 4* 9 | . . 1
---------+----------+---------
. 3 . | 9 . 1 | . . 6
9 . . | 4 . 6* | 3 . .
. 6 8 | 3* . 5 | 9 1 .
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 6 in row 4, column 9. Column 9 already has a printed 6 (row 7, column 9). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 9.
## 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.