8
1
2
3
6
7
8
3
4
8
2
7
9
2
3
8
2
5
4
5
6
2
4
2
6
5
7
1
Time 00:00
Mistakes 0
Ready
Expert Sudoku #139
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 38.8 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 5, column 5 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.