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Hard · Puzzle #921
3
5
6
1
3
5
8
9
1
4
1
9
6
7
6
9
7
8
5
2
7
9
6
8
9
4
"Equipped with his five senses, man explores the universe around him and calls the adventure Science." — Edwin Hubble
"Equipped with his five senses, man explores the universe around him and calls the adventure Science." — Edwin Hubble
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.