5
4
7
3
9
8
3
5
2
7
2
1
9
3
5
6
1
1
8
7
3
3
8
2
7
5
6
5
9
8
Time 00:00
Mistakes 0
Ready
Expert Sudoku #157
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 30 of 81 |
| Technique score | 51.8 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 1, column 2 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.