Intrigued by KenKen? Novices can tie on their white belts and begin their puzzle-solving journey here with these 300 puzzles. But be warned: once you begin, you'll never want to stop! Acclaimed Japanese mathematics instructor Tetsuya Miyamoto developed KenKen in 2004 with the goal of improving his students' maths and logic skills. This understandable, fun and challenging puzzle quickly became a favourite leisure activity for all ages throughout Japan and then for millions of players worldwide. Now it's carried in the New York Times, Los Angeles Times, Chicago Tribune, The Times of London, Scholastic classroom magazines, and more.