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