A best Sunday crossword puzzle book can help keep your mind stimulated. One of the best ways to keep your mind sharp is it exercise it regularly. Enjoying a crossword puzzle every Sunday is a great way to make sure that you provide your brain with regular exercise. Working crossword puzzles will keep your brain and mind fit. Crossword puzzles also provide you with a regular opportunity to learn new material. And they are a great way to relax and enjoy your Sunday!