Challenge Yourself

Can you identify the technique needed to make the next move before filling in any digit? Name it, then use it.

Challenge Yourself
✓ Completed! 👍
5
8
2
3
4
8
4
5
7
6
4
9
2
1
7
5
7
1
9
8
2
7
6
5
Mathematical Mind

"The pleasure we obtain from music comes from counting, but counting unconsciously." — Gottfried Wilhelm Leibniz

Mathematical Mind