4
2
5
4
8
2
1
6
9
4
6
4
2
1
5
9
7
2
8
4
6
9
1
3
7
1
2
5
7
Time 00:00
Mistakes 0
Ready
Expert Sudoku #79
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 29 of 81 |
| Technique score | 54.1 |
| Rated techniques | 6 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 5, 2 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.