PlaySudoku.us
Hard · Puzzle #281
4
5
8
3
7
8
7
9
4
5
7
1
8
9
9
1
4
3
2
5
8
6
7
5
6
4
8
1
2
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