9
3
7
2
8
9
6
1
2
3
5
6
3
8
6
5
2
4
1
3
3
8
7
8
3
7
9
Time 00:00
Mistakes 0
Ready
Hard Sudoku #147
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 27 of 81 |
| Technique score | 128.8 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 6, column 9 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.