Ready for a Real Challenge?Put your solving skills to the test with this wild and wicked collection of KenKen puzzles. Features:· 100 challenging KenKen puzzles using addition, subtraction, multiplication and division· Introduction and \"how to solve\" instructions from legendary New York Times crossword editor Will Shortz· Big grids with lots of space for easy solving | Will Shortz Presents Crazy for KenKen Killer by Tetsuya Miyamoto, Paperback | Indigo Chapters