A Brain Games Crossword Puzzle book can help keep the mind active. When you complete the puzzles in the book, you will think about the various answers that can fit in the spaces provided. There could be more than one word, and you have to look at how each word will fit next to the other answers that are adjacent to that word. There are crossword puzzle books for adults as well as some that have children's puzzles so that children can use reading and spelling skills.