Many board games are now available as video games, which can include the computer itself as one of several players, or as a sole opponent. Many board games can now be played online against a computer and/or other players. Some websites allow play in real time and immediately show the opponents' moves, while others use email to notify the players after each move. The internet and cheaper home printing has also influenced board games via print-and-play games that may be purchased and printed. Some games use external media such as audio cassettes or DVDs in accompaniment to the game.