4 Books-In-1! The biggest compilation book of puzzles ever released by Mensa(R)--the smartest brand in the world! 400 brain-teasers and logic games to keep your mind sharp! Esteemed puzzle master David Millar and American Mensa(R) have compiled hundreds of logic and problem-solving puzzles in the form of both word and number challenges that will keep you entertained for hours. The range of puzzle types include: MazesSudokuStory logicBlank-filling puzzlesRiddlesAnd more! The hours of brain-training fun will help you improve your memory and exercise those mind-muscles. This book can be used and appreciated by anyone who wants to keep their mind sharp and in tip-top shape--something absolutely everyone will benefit from.