8
5
1
3
6
4
7
2
9
2
5
6
2
4
7
8
3
9
5
6
9
6
1
3
8
3
Time 00:00
Mistakes 0
Ready
Hard Sudoku #20
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 26 of 81 |
| Technique score | 119 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 4, 3 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.