PlaySudoku.us
Expert · Puzzle #729
5
9
7
9
5
8
4
9
2
2
1
4
9
3
7
8
1
3
6
1
4
3
7
6
4
Techniques used
- Naked Single
- Hidden Single
- Pointing Pair
- Box-Line Reduction
- 2-String Kite
- XY-Chain
- XY-Wing
"A journey of a thousand miles begins with a single step." — Laozi
"A journey of a thousand miles begins with a single step." — Laozi
Every row, column, and box in a completed Sudoku sums to 45 — the sum of digits 1 through 9. A useful sanity check.
Every row, column, and box in a completed Sudoku sums to 45 — the sum of digits 1 through 9. A useful sanity check.