One Newspaper Crossword Puzzle, Many Readers

How about transparent post-it notes that you can stick on the crossword puzzle and write on - to make your attempt at the puzzle before giving it to someone else. You don't want to spoil someone else's fun. This could be a billion dollar idea - think of how many old people there are. 2/3 of all the people in the history of the world who have lived past 65 are alive today.