Boost your brainpower with KenKen! This collection of KenKen will help you flex your mental muscles. So grab a pencil and see if you're a KenKen master! Includes:- 100 challenging KenKen puzzles- Puzzles that range in size from easy 5x5 grids to mind-bending 9x9 grids- Introduction and solving instructions by puzzlemaster Will Shortz | Will Shortz Presents Brain-Training KenKen by Tetsuya Miyamoto, Paperback | Indigo Chapters