---
title: "Mistake Rush #20: 5 Sudoku Boards, 5 Mistakes | Sudoku Flow"
description: "Five small Sudoku boards, one wrong number in each. Mistake Rush #20: count how many you find, then check every answer."
url: https://sudokuflow.com/puzzles/mistake-rush-20/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Mistake Rush #20
Mistake Rush
# Mistake Rush #20
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/yWLd_amYKG4)
## Board 1 · 4×4
Tap the digit you think is wrong.
Mistake Rush #20 · Board 1 · 4×4:
```text
1 3 | 4 2*
. . | 3 1*
------+------
. 2* | 1 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 1 in row 4, column 1. Column 1 already has a printed 1 (row 1, column 1). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 4.
## Board 2 · 4×4
Tap the digit you think is wrong.
Mistake Rush #20 · Board 2 · 4×4:
```text
2* 3 | 4* .
. 1 | . 3
------+------
3 . | 1* 2*
4* . | 3 4
```
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 4, column 1. Row 4 already has a printed 4 (row 4, column 4). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## Board 3 · 6×6
Tap the digit you think is wrong.
Mistake Rush #20 · Board 3 · 6×6:
```text
3 1 4* | 5 . 2*
5 2* 6 | . 1 3
---------+---------
1 . 3 | . 2* 5
2 6* 5* | 3 . 1
---------+---------
4* 3 . | 1* 5 6*
. . 6* | . 3* .
```
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 6, column 3. Column 3 already has a printed 6 (row 2, column 3). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 1.
## Board 4 · 6×6
Tap the digit you think is wrong.
Mistake Rush #20 · Board 4 · 6×6:
```text
5 3 6 | 1* . 4
4* 2* 1* | 3 6 5*
---------+---------
. . 4 | 5* 3 6
3 6* . | . 1* .
---------+---------
. 4 . | 6 . 3*
6 5 3 | 2* 5* .
```
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 2). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 4.
## Board 5 · 6×6
Tap the digit you think is wrong.
Mistake Rush #20 · Board 5 · 6×6:
```text
3 . 2 | . 5* 6
. 4 . | 3 . 1*
---------+---------
1* 5 3* | 6 2* 4*
2* 6 4 | 5 3 1
---------+---------
5* 2 6* | . 4* .
. 3 . | 2 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 2, column 6. Column 6 already has a printed 1 (row 4, column 6). A printed digit can't be wrong, so the blue one is. The right digit for that cell is 2.
## 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.