PlaySudoku.us
Hard · Puzzle #956
2
1
6
7
2
9
3
4
7
8
9
1
2
3
6
5
4
2
1
9
9
1
5
3
6
2
4
"The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking." — Albert Einstein
"The world as we have created it is a process of our thinking. It cannot be changed without changing our thinking." — Albert Einstein
The number of essentially different Sudoku grids, accounting for symmetry, is 5,472,730,538 — about 5.5 billion.
The number of essentially different Sudoku grids, accounting for symmetry, is 5,472,730,538 — about 5.5 billion.