Will Shortz Presents the Dangerous Book of Sudoku: 100 Devilishly Difficult Puzzles

Are you up for the challenge? Put your sudoku-solving skills to the test with this collection of ferocious sudoku puzzles!

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.