7
5
8
4
1
6
1
4
7
9
3
9
4
1
5
2
7
6
2
8
7
8
9
4
1
3
5
Time 00:00
Mistakes 0
Ready
Medium Sudoku #180
You will want pencil marks: locked candidates, pairs and triples.
| Difficulty | Medium |
| Clues given | 27 of 81 |
| Technique score | 109.2 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 9 already sees all eight other digits in its row, column and box, so it can only be 4.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.