It took three months to create, so how long will it take to crack ...the world's hardest Sudoku? | Daily Mail Online
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World's hardest sudoku puzzle ever: Can you solve the most baffling brainteaser ever devised? - Mirror Online
True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku? | Daily Mail Online
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World's Hardest Sudoku Puzzle
