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

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

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

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

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