50 books • 4 series
Headspinners
Mind Munchers
Hamlet and Piglet
Tom
Head Spinners
Amazing Head Spinning Mazes
Brain Baffling Picture Puzzles
Abecelios
Misterios Para Ojos de Lince
Drain Your Brain
Totally Amazing Games and Puzzles
Amazing Mazes 3
Amazing Mazes 2 (Amazing Mazes 2)
Ultimaze Book
Amazing Mazes II
Mega Mindtwisters
Mega Mind-Twisters
Ultimaze (Puzzle Books)
Bizarre Brain Benders
Rolf Heimann's Perplexing Picture Puzzles (Puzzle Books)
Bizarre Brainbenders (Puzzle Books)
Awesome Alphamaze (Puzzle Books)
Preposterous Puzzles (Hippo puzzles)
Amazing Mazes (Puzzle Books)