3
1
7
9
5
8
4
8
7
8
3
4
9
6
1
3
3
7
5
8
5
7
6
6
1
2
3
2
8
Time 00:00
Mistakes 0
Ready
Expert Sudoku #177
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 29 of 81 |
| Technique score | 57 |
| Rated techniques | 3 |
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.