1
5
6
9
5
8
2
8
4
7
7
4
9
6
1
5
9
8
9
3
5
9
1
2
3
4
Time 00:00
Mistakes 0
Ready
Hard Sudoku #158
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 116.2 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 3, column 3 already sees all eight other digits in its row, column and box, so it can only be 9.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.