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