The Mensa Genius Quiz Book (Match Wits with Mensa)Are You a Genius? Let The Mensa Genius Quiz Book help you find out. This collection of quizzes, puzzles, games, and strategies is guaranteed to tax your intelligence, provide hours of entertainment, and make you jumping up and down crazy for the right answers. You need an I. Q. in the top two percent of the population to join Mensa, but with the sample tests inside you can see how you'd rate alongside such famous M's (as Mensans call themselves) as R.