100 more Sudoku puzzles from NPR’s Puzzlemaster Will Shortz. If you haven’t tried this puzzle craze, what are you waiting for?! This book of 100 “wordless crossword puzzles” is carefully calibrated for difficulty—from light and easy at the beginning to quite hard at the end. They are designed to be done while taking a coffee break, lolling on the sofa, commuting to work (as long as you aren’t the driver), or whenever or wherever you like to solve sudoku in a relaxed atmosphere. So what do you say….do you sudoku?