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Mensa Logic Puzzles: More than 150 brainteasers to test your powers of deduction
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Mensa's Most Difficult Geometric Puzzles: Tricky puzzles to challenge every angle
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Mensa's Most Difficult Logic Problems: Test your powers of reasoning with exacting enigmas
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Mensa's Most Difficult Maths Tests: Prove your arithmetic prowess by solving the toughest numerical puzzles
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