---
title: "Mistake Rush #18: 5 Sudoku Boards, 5 Mistakes | Sudoku Flow"
description: "Five small Sudoku boards, one wrong number in each. Mistake Rush #18: count how many you find, then check every answer."
url: https://sudokuflow.com/puzzles/mistake-rush-18/
language: en
---
[Puzzles](https://sudokuflow.com/puzzles/) / Mistake Rush #18
Mistake Rush
# Mistake Rush #18
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/aCTrTQSEmc4)
## Board 1 · 4×4
Tap the digit you think is wrong.
Mistake Rush #18 · Board 1 · 4×4:
```text
1 3 | 2* 4
4* . | . 3
------+------
2 4* | 3* 1
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 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 3.
## Board 2 · 4×4
Tap the digit you think is wrong.
Mistake Rush #18 · Board 2 · 4×4:
```text
4* 1* | 2 .
. 2 | 1 4
------+------
. . | . 1*
2* 3* | 4 2
```
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 4, column 1. Row 4 already has a printed 2 (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 #18 · Board 3 · 6×6:
```text
1 3 5* | . . 6*
6 2* 4 | . 3* .
---------+---------
4 5 3* | . 6* 1
. 1 6 | 3 5* 4
---------+---------
. . 2 | 6* . 3
3* 6* 4* | 5 . 2
```
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 6, column 3. Column 3 already has a printed 4 (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 #18 · Board 4 · 6×6:
```text
6 . 1 | 3* . 6*
3* . . | 2* 1* .
---------+---------
1 3* 6 | 4 . .
2 5 . | . 6 .
---------+---------
5 1* 3* | 6 4 2
4 6* 2* | 5 3 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 1, column 6. Row 1 already has a printed 6 (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 5 · 6×6
Tap the digit you think is wrong.
Mistake Rush #18 · Board 5 · 6×6:
```text
1 3* 4 | 5 6 2*
5* 2* . | 4 . 3
---------+---------
3 4* . | . 5* 6
6* 5* . | . 4 1*
---------+---------
1* . . | 6 3 4
4 6 . | 1 2* .
```
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 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 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.