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World's hardest Sudoku puzzle book for adults vol 2 : A Challenging Sudoku book for Advanced Solvers a fun way to Challenge your Brain . Solutions included . (Paperback) - Walmart.com
World's hardest sudoku puzzle ever: Can you solve the most baffling brainteaser ever devised? - Mirror Online
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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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