4
1
6
3
3
2
1
8
4
5
8
4
1
2
5
6
6
4
9
5
7
4
8
7
9
Time 00:00
Mistakes 0
Ready
Hard Sudoku #189
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 25 of 81 |
| Technique score | 123.4 |
| Rated techniques | 5 |
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.