8
4
9
3
1
3
7
5
9
6
5
2
1
9
6
7
4
5
3
8
5
6
9
3
4
5
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #16
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 27 of 81 |
| Technique score | 130 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 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.