3
7
8
7
8
4
9
1
2
9
6
3
8
1
3
5
6
7
1
3
2
6
3
9
5
1
9
Time 00:00
Mistakes 0
Ready
Expert Sudoku #21
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 27 of 81 |
| Technique score | 44.2 |
| Rated techniques | 3 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 5 already sees all eight other digits in its row, column and box, so it can only be 7.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.