2
8
3
5
9
2
3
7
6
1
1
4
2
3
4
6
1
5
8
7
4
6
8
1
9
3
2
9
Time 00:00
Mistakes 0
Ready
Expert Sudoku #137
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 33.1 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 6, column 4 already sees all eight other digits in its row, column and box, so it can only be 9.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.