Mensa's Most Difficult Number Puzzles: Prove your logical and numerical abilities against 200 fiendish problems

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

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

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

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