---
title: "Find the Mistake Level Up #16: 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 #16: play every level and see each answer."
url: https://sudokuflow.com/puzzles/level-up-16/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Level Up #16
Level Up
# Level Up #16
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/QmHiDTMj8hg)
## Level 1 · 4×4
Tap the digit you think is wrong.
Level Up #16 · Level 1 · 4×4:
```text
2* . | 3 1
3 . | 4 2*
------+------
4* 2* | . 1*
1 3 | . .
```
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 4. Column 4 already has a printed 1 (row 1, column 4). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 3.
## Level 2 · 6×6
Tap the digit you think is wrong.
Level Up #16 · Level 2 · 6×6:
```text
1* 6* 3 | 5* . 6
5 . 2 | 3 1* 4*
---------+---------
. 3 . | . 5* 1
2 5* 1* | 4 6 .
---------+---------
6 2 4 | . . 5*
3 1* 5* | . 4 .
```
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 1, column 2. Row 1 already has a printed 6 (row 1, column 6). 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 #16 · Level 3 · 9×9:
```text
. 7 . | 8* 5* 2 | 4 1* 9*
8 5* 2 | 4 1 9 | 6 7* 3*
4 1* 3* | 6* 7* 3 | 8* 5* 2*
---------+----------+---------
. 6 8 | . . . | 2 9 1*
. 2* 4 | 1 9 . | 5 . 8*
. 9 1 | 2 8 . | 7 . 4*
---------+----------+---------
2 3* . | 7 . 1 | 9 . 5*
1 8* 7 | . . . | 3 . 6
9 4 . | . . . | 1* 2 7
```
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 3. Row 3 already has a printed 3 (row 3, column 6). 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.