Challenge Yourself

Solve an Expert puzzle in under 15 minutes. Study one new advanced technique before you begin.

Challenge Yourself
✓ Completed! 👍
8
3
7
2
4
8
5
9
2
4
2
1
6
6
7
5
7
4
9
2
6
3
1
Pro Tip

Scan by digit rather than by cell: find everywhere '7' must go before switching to '8'.

Pro Tip