6
9
2
5
9
1
3
2
7
1
6
8
5
8
3
6
2
5
9
4
1
4
3
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #35
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 24 of 81 |
| Technique score | 108.3 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 5 already sees all eight other digits in its row, column and box, so it can only be 4.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.