<p>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. <p/>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! <p/>Volume 3 contains 100 KenKen puzzles that use all for mathmatical applications with How to Solve instructions and an introduction by puzzlemaster Will Shortz.</p>