4
1
8
6
5
9
7
4
8
1
4
4
6
2
8
5
9
7
1
4
7
6
8
2
6
9
2
5
Time 00:00
Mistakes 0
Ready
Expert Sudoku #163
XY-Wings, forced chains and positions that punish impatience.
| Difficulty | Expert |
| Clues given | 28 of 81 |
| Technique score | 25.2 |
| Rated techniques | 5 |
Techniques this puzzle needs
Where to start
The first move on this board is a Naked Single: Row 7, column 2 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.