PlaySudoku.us
Hard · Puzzle #531
7
6
8
3
5
8
9
3
5
1
9
7
3
4
1
5
9
7
8
4
1
8
8
2
6
5
3
5
1
7
6
"Quality is not an act, it is a habit." — Aristotle
"Quality is not an act, it is a habit." — Aristotle
The brain releases dopamine when it solves a puzzle — the same reward chemical triggered by food and exercise.
The brain releases dopamine when it solves a puzzle — the same reward chemical triggered by food and exercise.