5
2
3
3
2
6
7
4
5
4
9
8
5
1
6
8
1
4
3
8
7
6
1
2
Time 00:00
Mistakes 0
Ready
Expert Sudoku #138
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 24 of 81 |
| Technique score | 56 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 4, column 1 already sees all eight other digits in its row, column and box, so it can only be 2.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.