KenKen can be described simply as sudoku with basic math (addition, subtraction and/or multiplication and division). It's a fun, addictive, clever puzzle that's winning fans the world over. Already more than one million KenKen books have been sold in Japan and is a huge hit in The Times of London. Now, America can catch KenKen fever! Volume 3 contains 100 KenKen puzzles that use all for mathmatical applications with \"How to Solve\" instructions and an introduction by puzzlemaster Will Shortz. | Will Shortz Presents Kenken Easy To Hard Volume 3 by Tetsuya Miyamoto, Paperback | Indigo Chapters