7
1
5
1
6
7
8
5
8
3
2
9
3
4
7
9
8
8
1
5
4
6
2
8
Time 00:00
Mistakes 0
Ready
Hard Sudoku #15
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 24 of 81 |
| Technique score | 111.3 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 2, 1 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.