After a busy day, grab a pencil and puzzle your cares away! 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. This edition contains 100 KenKen puzzles that use all four mathematic applications along with solving instructions and an introduction by puzzlemaster Will Shortz. | Will Shortz Presents KenKen for Stress Relief by Tetsuya Miyamoto, Paperback | Indigo Chapters