8
6
2
1
2
9
5
4
6
2
4
8
9
9
7
1
3
6
2
9
4
3
9
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #40
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 24 of 81 |
| Technique score | 111.3 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 4 already sees all eight other digits in its row, column and box, so it can only be 7.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.