12 books • 1 series
Almost Impossible Puzzles
Puzzles, Numbers and Infinity
Brain Boost
Yoga for Your Brain
Almost Impossible Brain Bafflers (Official Mensa Puzzle Book S.)
The World's Biggest Book of Brainteasers & Logic Puzzles
Classic Brain Twisters
Make Success Your Friend
Life is a Journey
Giant Book of Mensa Mind Challenges
Nearly Impossible Brain Bafflers
The Ticket to Heaven and Other Superior Puzzles