PlaySudoku.us
Hard · Puzzle #16
9
8
1
4
3
5
4
2
1
8
9
3
9
4
8
6
7
5
1
2
6
7
1
8
4
5
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.