Will Shortz is kind of like the crown prince of the puzzle world. In fact, he’s the only person in the world to hold a college degree in Enigmatology (a.k.a. the study of puzzles.) And in Will Shortz Presents The Little Black Book of Sudoku, he brings us 400 mind-bending puzzles arranged according to difficulty. This sleek, chic, spiral-bound book is perfect for stashing in your purse, backpack or briefcase for a quadruple brain lobe workout wherever you go. Makes a great gift for Sudoku fanatics with a discerning eye for style.