Math Insight

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

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

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

Math Insight