True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?
Por um escritor misterioso
Descrição
Finnish mathematician Arto Inkala spent three months designing a Sudoku puzzle with only one solution. On the scale of 1-5 in difficulty, he rated the puzzle as 11.
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True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?
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