"""KenKen was developed in 2004 by acclaimed Japanese math educator Tetsuya Miyamoto. His educational philosophy is: """"The Art of Teaching Without Teaching."""" KenKen is a fun and addictive puzzle for people of all ages. It improves logical deduction skills while using fundamental mathematics -- addition, subtraction, multiplication and division. KenKen actively stimulates the mind, whether its use is in the home, classroom or on the beach.""" read full review »