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 About the Author: TETSUYA MIYAMOTO , the creator of KenKen, is a math teacher who runs a unique mathematics class for grade school children in Japan where he practices "The Art of Teaching Without Teaching." His teaching method and use of KenKen in his classroom has proven extremely successful. His students regularly go on to be accepted at the most prestigious schools in Tokyo. WILL SHORTZ has been the crossword puzzle editor of The New York Times since 1993. He is also the puzzlemaster on NPR's Weekend Edition Sunday and is founder and director of the annual American Crossword Puzzle Tournament. He has edited countless books of crossword puzzles, Sudoku, KenKen, and all manner of brain-busters.