15 books • 2 series
The Book of Games
Tease Your Brain, Test Your Smarts
Memory Games
Matchstick Puzzles
The Big Brain Workout
Fantastic Paper Airplanes
Tricky Optical Illusion Puzzles
New Book of Puzzles
World of Games
Creative Puzzles of the World
Puzzles Old and New
Paper Capers
Kite Flight (Owl Books)
Puzzles with Paper and Cardboard
Paper Flight (Paper Flight, #1)