Will Shortz Presents Stay Sharp Sudoku: 200 Challenging Puzzles by Shortz, Will

Watch out! These Sudoku puzzles are going to make you sweat. Includes: -200 very hard puzzles-Perfect portable size-Edited by Will ShortzAuthor: Will ShortzPublisher: St. Martin's GriffinPublished: 10/29/2013Pages: 320Binding Type: PaperbackWeight: 0.47lbsSize: 7.18h x 5.06w x 0.86dISBN: 9781250039217About the AuthorWill Shortz has been crossword editor of The New York Times since 1993. He is also the puzzlemaster on NPR's Weekend Edition Sunday and the founder and director of the annual American Crossword Puzzle Tournament.