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

"It is not knowledge, but the act of learning, not possession but the act of getting there, which grants the greatest enjoyment." — Carl Friedrich Gauss

Mathematical Mind