KenKen is the brilliant successor to Su Doku that's taken Japan by storm selling over one million copies in less than a year! Created by 'puzzle Samurai' Mr Miyamoto, KenKen is a fun new way to improve your maths skills. Each colour-coded KenKen title has a different level of difficulty and includes a range of mathematical skills. Books three and four are perfect for those who have already practised KenKen or are more confident with their maths skills.