PlaySudoku.us
Medium · Puzzle #56
9
6
4
5
7
9
6
4
3
1
6
2
4
1
2
9
5
6
7
9
7
3
5
1
2
6
4
7
7
9
2
3
8
5
2
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.
Puzzle-solving is used as therapy for anxiety: the focused concentration it requires quiets the mind's rumination.
Puzzle-solving is used as therapy for anxiety: the focused concentration it requires quiets the mind's rumination.