Pro Tip

Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.

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

Box-Line Reduction: if all candidates for a digit in a row or column are within one box, eliminate that digit from the rest of the box.

Pro Tip