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