PlaySudoku.us
Hard · Puzzle #625
6
2
1
4
8
3
1
7
8
2
5
9
3
1
3
4
9
7
7
6
8
2
4
8
5
9
"The wisest mind has something yet to learn." — George Santayana
"The wisest mind has something yet to learn." — George Santayana
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.
The minimum number of clues needed to create a valid Sudoku with a unique solution is 17.