PlaySudoku.us
Expert · Puzzle #510
6
5
2
9
8
2
6
1
3
9
4
2
9
1
1
8
6
6
2
4
3
7
3
"A chess game is divided into three phases: the first, when you hope you have the advantage, the second when you believe you have an advantage, and the third when you know you're going to lose." — Savielly Tartakower
"A chess game is divided into three phases: the first, when you hope you have the advantage, the second when you believe you have an advantage, and the third when you know you're going to lose." — Savielly Tartakower
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.