True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?

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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.
True test of genius or monumental waste of time? Can you solve the hardest  ever Sudoku?
True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku?
True test of genius or monumental waste of time? Can you solve the hardest  ever Sudoku?
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