4
2
1
9
6
9
7
3
4
9
6
7
6
8
7
3
1
3
1
7
5
9
1
4
6
7
9
Time 00:00
Mistakes 0
Ready
Expert Sudoku #28
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 27 of 81 |
| Technique score | 57.6 |
| Rated techniques | 7 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 4 already sees all eight other digits in its row, column and box, so it can only be 8.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.