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Free and printable Sudoku puzzles for young and old to challenge and develop your logic and thinking skills.
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Daily Mail: Sudoku Xtreme: The Only Puzzles With The 'X" Factor by Christopher Monckton - 9780755315307
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Junior Sudoku X by Christopher Monckton | Headline Publishing Group, home of bestselling fiction and non-fiction books and ebooks
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Puzzling behaviour: Maths professor finds the formula that will solve ANY Sudoku | Daily Mail Online
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True test of genius or monumental waste of time? Can you solve the hardest ever Sudoku? | Daily Mail Online
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