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