From puzzlemaster and New York Times crossword editor Will Shortz comes sudoku, the new wordless crossword puzzle that’s taking the world by storm! Once you start, you won’t want to stop. These addictive puzzles are easy to explain - just fill the grid with numbers according to the few simple rules - but incredibly fun and engaging to complete. You don’t need any mathematics knowledge: Just supply a pencil and an inquisitive mind.Contains 350 puzzles