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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! Are you a KenKen expert? Then see if you have the skills to handle these 300 high-level puzzles!