Treat your brain to “the most addictive puzzle since Sudoku” (Will Shortz). Created by a Japanese math teacher as a teaching tool for his students, KenKen has mushroomed into a global phenomenon, selling millions of books and syndicated in over 100 newspapers and magazines, including <i>The New York Times</i>. With its simple rules and tough yet elegant solutions, KenKen appeals to puzzlers of all ages. The puzzles for 2012 are all new. They begin easy every Monday and grow progressively more difficult over the course of the week.<br>