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! 👍
2
1
9
4
7
3
8
6
7
8
1
5
6
4
9
2
6
5
7
1
9
4
2
6
4
9
3
5
6
7
9
4
8
7
6
5
9
8
9
3
5
2
6
4
3
8
6
7
9
5
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