PlaySudoku.us
Hard · Puzzle #672
8
5
6
1
3
2
6
7
1
8
9
6
3
4
4
6
1
2
4
9
3
6
5
3
5
8
1
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.
"It is not enough to be a good player; you must also play well." — Siegbert Tarrasch
"It is not enough to be a good player; you must also play well." — Siegbert Tarrasch