4
8
3
1
2
8
5
1
6
4
8
2
9
5
1
7
4
2
5
7
3
5
7
6
3
3
1
6
2
8
Time 00:00
Mistakes 0
Ready
Expert Sudoku #184
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 30 of 81 |
| Technique score | 47.2 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 6, column 8 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.