PlaySudoku.us
Evil · Puzzle #854
7
6
4
3
1
7
2
6
5
4
1
8
5
3
2
1
6
8
8
4
9
7
9
"Tell me and I forget. Teach me and I remember. Involve me and I learn." — Benjamin Franklin
"Tell me and I forget. Teach me and I remember. Involve me and I learn." — Benjamin Franklin
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.