Acclaimed Japanese mathematics instructor Tetsuya Miyamoto developed KenKen in 2004 and it has since taken over the puzzling world. It takes a page from karate - another Japanese art - each title is graded by colour: White for easy, Green for medium, Brown for hard & Black Belt, for the super-tough! All in a handy-sized format, so puzzle lovers can play this addictive game wherever the mood takes them! Intrigued by KenKen? Novices can tie on their white belts and begin their puzzle-solving journey here. But be warned: once you begin, you'll never want to stop! It includes 300 puzzles.