15 books
Classic Whodunits
Classic Optical Illusions
Classic Magic Tricks
World's Trickiest Puzzles
World's Greatest Magic Tricks
World's Most Incredible Puzzles
World's Most Amazing Puzzles
World's Greatest Puzzles
World's Best Magic Tricks
World's Most Baffling Puzzles
World's Toughest Puzzles
The World's Most Challenging Puzzles
World's Best Puzzles
The Clue Club
Merlin's Puzzler Two