5
8
7
2
4
6
5
3
1
2
7
8
4
9
2
6
4
5
1
3
2
4
6
9
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #170
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 107.2 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 6 already sees all eight other digits in its row, column and box, so it can only be 1.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.