PlaySudoku.us
Hard · Puzzle #909
9
4
7
5
8
8
6
3
4
2
5
8
7
9
3
5
6
4
1
8
3
8
1
2
1
4
8
7
6
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.
"If you spend too much time thinking about a thing, you'll never get it done." — Bruce Lee
"If you spend too much time thinking about a thing, you'll never get it done." — Bruce Lee