PlaySudoku.us
Hard · Puzzle #840
9
2
8
8
4
5
6
4
9
3
4
8
6
5
1
9
3
6
6
7
1
9
2
1
8
3
"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.