2
9
3
5
6
8
3
6
1
7
8
2
7
4
8
5
3
8
7
8
1
6
3
8
2
1
2
9
Time 00:00
Mistakes 0
Ready
Hard Sudoku #104
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 28 of 81 |
| Technique score | 115.9 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 8 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.