PlaySudoku.us
Hard · Puzzle #679
6
1
8
2
7
8
7
9
2
3
4
9
8
3
1
9
4
7
6
9
7
1
6
2
7
1
8
6
"The only impossible journey is the one you never begin." — Tony Robbins
"The only impossible journey is the one you never begin." — Tony Robbins
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.