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

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

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

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

Mensa's Most Difficult Number Puzzles: Prove your logical and numerical abilities against...