The Essential Book of Su Doku

201 Puzzles, 5 Levels of Difficulty! Su Doku is a deceptively simple, completely addictive number-placement game -- and the biggest craze to sweep the world in years. To succeed, a player needs patience and an aptitude for logic (which playing the game helps to develop). You do not need to be good at math or a genius at crosswords; you do not need to have ever played the game before. All you need is a pencil and this book. With more than 200 puzzles created especially for this book, The Essential Book of Su Doku will bring hours of fun to those encountering the game for the first time as well as to those who have already fallen under its spell.