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