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Michael O'Mara BooksISBN 9781780557830
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More than 80 mind-boggling number games, including arithmetic chains, number pairs, sudoku puzzles, time tests and loads more.
Gareth Moore
Gareth Moore, PhD, the best-selling author of more than 250 brain-training and puzzle books, currently serves as a director of the UK Puzzle Association.
More by Gareth Moore
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