4
5
9
2
2
1
3
5
8
8
1
3
6
3
2
4
3
4
9
2
2
6
7
5
5
2
8
7
Time 00:00
Mistakes 0
Ready
Expert Sudoku #4
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 23.6 |
| Rated techniques | 3 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 8, column 5 already sees all eight other digits in its row, column and box, so it can only be 3.
Progress is saved in this browser automatically. Use the keyboard: arrows to move, 1–9 to fill, N for notes, H for a hint.