PlaySudoku.us
Hard · Puzzle #832
4
8
5
9
3
6
8
7
2
9
3
9
6
7
3
8
2
5
7
7
4
1
5
3
6
7
3
4
2
8
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.
Retired people who solve puzzles daily have been shown in multiple studies to score higher on memory tests than non-puzzlers of the same age.
Retired people who solve puzzles daily have been shown in multiple studies to score higher on memory tests than non-puzzlers of the same age.