4
5
8
1
3
7
9
2
1
1
5
8
5
9
8
2
8
7
9
6
3
7
9
8
4
6
7
5
Time 00:00
Mistakes 0
Ready
Expert Sudoku #42
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 40.4 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Hidden Single: In this row 4, 9 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.