8
6
5
7
1
2
5
7
3
5
9
7
4
2
3
7
8
6
4
1
6
4
2
Time 00:00
Mistakes 0
Ready
Hard Sudoku #222
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 23 of 81 |
| Technique score | 191 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 2, 5 can only go in one cell, so it must go there.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.