8
2
5
9
6
7
9
8
3
4
5
3
6
7
9
5
1
8
6
1
2
9
4
8
7
Time 00:00
Mistakes 0
Ready
Hard Sudoku #99
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 150.4 |
| Rated techniques | 6 |
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.