The real deal. From Nikoli, the Japanese company that helped launch the Sudoku craze and gave the game its name, this calendar provides fanatics the challenge they crave with a daily puzzle in full color. And new this year, test your Sudoku mettle once a month with a Visual Sudoku puzzle, in which the numbers have been replaced by symbols or images. Starting off easy each weekend, the puzzles increase in difficulty over the course of the week— puzzles handcrafted, literally, by masters who anticipate your every move. Can you stay one step ahead?