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