PlaySudoku.us
Hard · Puzzle #575
6
4
7
9
3
3
8
4
5
6
7
2
9
5
9
4
7
1
5
2
9
5
1
8
9
1
3
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.
If you're stuck, look for Pointing Pairs: two candidates in a box that share a row or column.
If you're stuck, look for Pointing Pairs: two candidates in a box that share a row or column.