8
3
4
6
1
9
3
2
5
2
9
4
3
8
5
7
2
2
1
3
8
6
1
2
3
3
5
7
Time 00:00
Mistakes 0
Ready
Expert Sudoku #178
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 54.1 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 7, column 8 already sees all eight other digits in its row, column and box, so it can only be 5.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.