PlaySudoku.us
Evil · Puzzle #72
2
5
6
5
7
4
3
5
8
6
4
1
8
8
2
1
4
9
3
3
6
1
2
7
9
The pigeonhole principle explains why 8 clues are never enough to guarantee a unique Sudoku solution.
The pigeonhole principle explains why 8 clues are never enough to guarantee a unique Sudoku solution.
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.