6
8
3
2
7
8
9
4
6
6
1
8
7
1
5
4
7
2
6
8
9
6
1
3
2
3
1
6
3
6
2
4
7
5
6
9
7
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.
During the 2006 World Cup in Germany, Sudoku books outsold football guides at Frankfurt airport.
During the 2006 World Cup in Germany, Sudoku books outsold football guides at Frankfurt airport.