PlaySudoku.us
Expert · Puzzle #626
3
4
2
1
4
3
8
9
8
9
1
5
7
2
1
2
6
1
8
7
5
6
"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.