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

Mensa's Most Difficult IQ Puzzles: Take on the ultimate challenge by solving...

Mensa's Most Difficult Maths Tests: Prove your arithmetic prowess by solving these...

Mensa: Logic Brainteasers: Tantalize and train your brain with over 200 puzzles

Mensa Logic Puzzles: More than 150 brainteasers to test your powers of deduction