I'm curious what happens on each system if you already have a save file for Sonic Mania Plus (physical), but try to run a copy of the later released standalone Sonic Mania. All I know so far is that if you bought a digital copy of Sonic Mania on PS4 and did not buy the Plus DLC separately, then bought the Plus disc, it deletes your digital copy from the system, makes you run it from the disc every time, but keeps your progress intact, essentially upgrading your existing file. What happens next if you buy a plain PS4 Sonic Mania disc for variant collecting purposes and decide to try using it? Will the Plus DLC remain on your save file and just run the disc as if it were a copy of Plus? Or will it install as a separate game with its own set of save files? What about Switch and Xbox One? How do those systems react to using Plus first, then plain afterward? On Wii U if you buy separate discs of New Super Mario Bros. U, New Super Luigi U, and New Super Mario Bros. U + New Super Luigi U, all three disc versions get their own set of save files and are treated as separate games.