You're mixing and matching various parts of information here... Basically, there are 3 major types of multi-disc games: 1. Play/Install disc, these types have a disc you use to play the game, and a content installation disc 2. Story continues on disc 2+, these are mostly common with big adventure games and such... they can maybe be merged together, or they have to be switched when the time comes, different for every game 3. Singleplayer/Multiplayer disc these types of games might also be
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