PlaySudoku.us
Hard · Puzzle #632
6
9
7
8
7
4
8
6
5
8
9
3
3
5
7
3
1
2
8
7
3
2
6
2
6
1
6
5
8
9
Solving Sudoku exercises the prefrontal cortex — the brain region responsible for planning and decision-making.
Solving Sudoku exercises the prefrontal cortex — the brain region responsible for planning and decision-making.
"Mathematics is not about numbers, equations, or algorithms — it is about understanding." — William Paul Thurston
"Mathematics is not about numbers, equations, or algorithms — it is about understanding." — William Paul Thurston