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World's Most Perplexing Puzzles is written by Charles Barry Townsend and published by Sterling Publishing (NY). It's available with International Standard Book Number or ISBN identification 0806912669 (ISBN 10) and 9780806912660 (ISBN 13).
Although referring to Townsend's The World's Most Challenging Puzzles, this quote is applicable to his entire puzzle canon. If you enjoy pitting yourself against the most challenging puzzles in existence and are a glutton for punishment, then one or all of these books are for you. Take your pick among "The World's Trickiest", "Super Brainy", "Most Perplexing", "Most Incredible", "Greatest", "Most Amazing", "Toughest", "Most Baffling", "Most Challenging", and "Best". Choose from any of the ten, or all ten, and see how you stand up against Charles Barry Townsend -- "the Professor of Perplexing Puzzles".