9
5
4
7
3
8
7
8
2
3
9
7
2
8
1
3
1
6
5
6
4
8
7
4
5
3
Time 00:00
Mistakes 0
Ready
Hard Sudoku #187
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 107 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, column 8 already sees all eight other digits in its row, column and box, so it can only be 5.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.