An expansion pack, expansion set, supplement, or simply expansion is an addition to an existing role-playing game, tabletop game, video game, collectible card game or miniature wargame. An expansion may introduce new rules or game mechanics that augment the original game and add more variety to playing it. In the case of video games, they typically add new game areas, weapons, objects, characters, adventures or an extended storyline to an already-released game. In tabletop role-playing games, they might take the form of a campaign setting or a stand-alone adventure for players to experience.