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Mensa Killer Sudoku: More than 200 of the most difficult number puzzles

by Moore, Dr. Gareth Dr. Gareth Moore, Mensa Ltd,

ISBN 13: 9781802791846

Format: paperback
Publisher: Welbeck

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Mensa's Most Difficult Logic Problems: Test your powers of reasoning with exacting enigmas

by Moore, Dr. Gareth Dr. Gareth Moore, Mensa Ltd,

ISBN 13: 9781787394285

Format: paperback
Publisher: Welbeck

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Mensa's Most Difficult Geometric Puzzles: Tricky puzzles to challenge every angle

by Jones, Graham Graham Jones, Mensa Ltd,

ISBN 13: 9781787394278

Format: paperback
Publisher: Welbeck

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