---
title: "Mistake Rush #15: 5 Sudoku Boards, 5 Mistakes | Sudoku Flow"
description: "Five small Sudoku boards, one wrong number in each. Mistake Rush #15: count how many you find, then check every answer."
url: https://sudokuflow.com/puzzles/mistake-rush-15/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Mistake Rush #15
Mistake Rush
# Mistake Rush #15
Five small boards, one wrong number in each. In the video you get a few seconds per board; here you can take your time.
[Watch on YouTube](https://youtube.com/shorts/urH3WFYX8Y0)
## Board 1 · 4×4
Tap the digit you think is wrong.
Mistake Rush #15 · Board 1 · 4×4:
```text
. 1 | 2 3*
4* 2 | 1* 4
------+------
. . | 4 2*
2 . | 3* .
```
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 2, column 1. Row 2 already has a printed 4 (row 2, column 4). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 3.
## Board 2 · 4×4
Tap the digit you think is wrong.
Mistake Rush #15 · Board 2 · 4×4:
```text
. 2* | 4 3
. 4* | 2 1
------+------
2* . | . 4*
4 . | 1 3*
```
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 4, column 4. Column 4 already has a printed 3 (row 1, column 4). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 2.
## Board 3 · 6×6
Tap the digit you think is wrong.
Mistake Rush #15 · Board 3 · 6×6:
```text
. 3 4 | 5 . .
. 2 . | . 1 4*
---------+---------
. 5 3* | 1* 5* 2
6 1* 2* | 4 . 3
---------+---------
. 6 5* | 2 4 1*
2 4* 1* | 6 3* .
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 5 in row 3, column 5. Row 3 already has a printed 5 (row 3, column 2). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 6.
## Board 4 · 6×6
Tap the digit you think is wrong.
Mistake Rush #15 · Board 4 · 6×6:
```text
5* . 6 | 3 . 2*
1* . 3* | 4 . .
---------+---------
2* 6 . | . . 3
3* 1* 5 | 6 4* 2
---------+---------
. . 1 | 2* 6 5
6 5 2 | 1* 3 4*
```
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 1, column 6. Column 6 already has a printed 2 (row 4, column 6). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## Board 5 · 6×6
Tap the digit you think is wrong.
Mistake Rush #15 · Board 5 · 6×6:
```text
1* . . | . 6* 5
. . 6 | 1* 2 .
---------+---------
6 5 3 | 2 1 4*
2* 1* 4 | 5 . 6*
---------+---------
4 6 1 | 3 . .
3* . 5 | 6* 5* 1*
```
Digits marked * were filled in by a player; the others were printed with the puzzle.
Show the answer
It's the blue 5 in row 6, column 5. Row 6 already has a printed 5 (row 6, column 3). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 4.
## 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.