PlaySudoku.us
Expert · Puzzle #91
9
6
3
9
2
7
5
8
4
9
6
7
4
9
2
1
5
4
2
1
8
4
1
9
5
Euler's "problème des 36 officiers" — an unsolvable 6×6 Latin square — is a direct mathematical precursor to Sudoku.
Euler's "problème des 36 officiers" — an unsolvable 6×6 Latin square — is a direct mathematical precursor to Sudoku.
In 2007, a British newspaper published a Sudoku with no unique solution — they had to issue an apology.
In 2007, a British newspaper published a Sudoku with no unique solution — they had to issue an apology.