8
2
9
7
5
4
5
8
8
2
4
7
6
4
4
1
3
3
9
4
9
1
6
5
6
7
1
Time 00:00
Mistakes 0
Ready
Hard Sudoku #209
Advanced patterns: X-Wings, triples and tighter candidate logic.
| Difficulty | Hard |
| Clues given | 27 of 81 |
| Technique score | 109.2 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 1, 4 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.