Challenge Yourself

Try a puzzle two difficulty levels above your usual. Struggle is how expertise grows.

Challenge Yourself
✓ Completed! 👍
9
5
6
2
7
6
3
4
7
9
4
2
3
1
6
2
1
6
4
3
2
6
4
8
3
1
4
5
8
6
2
8
3
5
6
1
8
4
7
6
1
5
8
9
3
Math Insight

Every row, column, and box in a completed Sudoku sums to 45 — the sum of digits 1 through 9. A useful sanity check.

Math Insight