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365 Very Hard Sudoku Puzzles For Adult : Hard 365 Sudoku puzzles for adults. 9X9 Grid, 4 puzzles per page. Sudoku instructions, basic strategy, and solutions to puzzles included Improve Your Memory
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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
World's hardest sudoku puzzle ever: Can you solve the most baffling brainteaser ever devised? - Mirror Online
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