10 books • 1 series
University of the Mind: Devilishly Difficult Word Play
University of the Mind: Fiendishly Formidable Number Conundrums
Sherlock: The Puzzle Book
Pyrgic Puzzler, The: Classic Conundrums
The Pyrgic Puzzler (Dover Recreational Math)
The Little Book of Puzzles
Mind Olympics
"Guardian" Book of Puzzles
Professor Percival Pinkerton's Clever Conundrums
Professor Percival Pinkerton's Most Perplexing Puzzles