PlaySudoku.us
Medium · Puzzle #107
6
4
5
4
1
2
3
1
9
8
5
6
7
9
3
8
1
8
6
6
4
1
3
6
3
8
6
7
4
2
1
5
7
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.