PlaySudoku.us
Hard · Puzzle #397
2
5
3
9
8
8
9
1
7
6
1
4
8
7
2
1
3
2
2
3
5
4
7
7
6
4
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