5
8
6
1
7
1
5
6
8
8
3
7
1
3
7
6
9
2
3
3
8
6
5
4
8
6
7
2
Time 00:00
Mistakes 0
Ready
Expert Sudoku #218
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 44.4 |
| Rated techniques | 4 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, 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.