4
6
1
4
8
8
5
2
7
9
4
9
1
7
8
6
3
7
2
5
9
1
8
6
1
3
2
4
7
7
3
8
6
5
9
9
4
7
3
3
Time 00:00
Mistakes 0
Ready
Easy Sudoku #178
Solvable by scanning alone — naked and hidden singles. A calm warm-up.
| Difficulty | Easy |
| Clues given | 40 of 81 |
| Technique score | 63.1 |
| Rated techniques | 2 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 2, column 3 already sees all eight other digits in its row, column and box, so it can only be 7.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.