Mensa's Most Difficult Maths Tests: Prove your arithmetic prowess by solving the toughest numerical puzzles

Mensa's Most Difficult Maths Tests: Prove your arithmetic prowess by solving the toughest numerical puzzles

Mensa's Most Difficult Pattern Puzzles: Unleash your creative problem-solving to crack 200 demanding brainteasers

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