Puzzle fans have bought more than 650,000 copies of the Mensa Genius Quiz series--the only books that let readers "match wits with Mensa," comparing how well they do against members of the famous high-IQ society. Here, in a giant omnibus edition, are four best-selling titles: The Mensa Genius Quiz Books 1 & 2, The Mensa Genius Quiz-A-Day Book, and The Mensa Genius ABC Book. Here are more than 800 fun mindbenders to exercise every part of your brain--word games, trivia, logic riddles, number challenges, visual puzzles--plus tips on how to improve your thinking skills. All...