PlaySudoku.us
Medium · Puzzle #666
1
9
7
2
6
9
3
7
8
2
5
9
3
9
1
7
3
4
4
5
4
6
2
8
4
7
3
2
9
2
4
9
7
1
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.
Retired architect Howard Garns, who invented the modern Sudoku, never knew it became a global phenomenon — he died in 1989.
Retired architect Howard Garns, who invented the modern Sudoku, never knew it became a global phenomenon — he died in 1989.