7
1
8
9
2
7
3
3
5
4
3
2
4
3
9
8
3
8
6
3
4
9
8
2
3
5
4
9
Time 00:00
Mistakes 0
Ready
Expert Sudoku #199
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 39.9 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 3, column 5 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.