PlaySudoku.us
Medium · Puzzle #456
5
8
6
3
5
9
8
4
4
7
1
8
3
7
4
9
1
9
6
2
7
3
7
6
5
1
8
1
5
4
9
8
2
2
6
7
5
If you solved one unique Sudoku puzzle per second, it would take you over 200 trillion years to solve every possible grid.
If you solved one unique Sudoku puzzle per second, it would take you over 200 trillion years to solve every possible grid.
Competitive Sudoku solvers can hold the full pencil-mark state of a 9×9 grid in working memory, updating it mentally as they go.
Competitive Sudoku solvers can hold the full pencil-mark state of a 9×9 grid in working memory, updating it mentally as they go.