Will Shortz Presents Kenken Easy to Hard Volume 3: 100 Logic Puzzles That Make You SmarterPaperback, 14 October 2008

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.