PlaySudoku.us
Medium · Puzzle #793
4
9
1
5
7
6
8
2
1
5
6
9
8
2
4
1
4
1
3
2
7
3
8
7
5
9
1
6
4
3
8
9
1
8
5
9
7
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.
"Life would be tragic if it weren't funny." — Stephen Hawking
"Life would be tragic if it weren't funny." — Stephen Hawking