3
2
1
8
5
8
1
4
8
4
5
9
3
2
4
7
8
2
3
6
6
9
1
4
3
7
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #167
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 27 of 81 |
| Technique score | 126.3 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 1 already sees all eight other digits in its row, column and box, so it can only be 2.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.