4
7
9
8
4
6
2
8
7
1
3
5
8
1
3
6
2
9
2
7
9
3
8
7
2
4
9
7
1
4
6
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.
The minimum number of clues (17) needed for a unique Sudoku was proved by exhaustive computer search in 2012.
"What lies behind us and what lies before us are tiny matters compared to what lies within us." — Ralph Waldo Emerson
"What lies behind us and what lies before us are tiny matters compared to what lies within us." — Ralph Waldo Emerson