Ok I have all of the mash up packs for the 360 version but I was wondering if there is any way to reset the premade world that comes with them. For example I go into the mhss effect world and change a bunch of stuff is there a way to get the world back to its original state?
Just create another. The buttons "Mass Effect World"; "Skyrim World"; "Halo World, etc." create new saves of the pre-made worlds that go with those packs. The game save files are named "Mass Effect Save"; "Skyrim Save"; "Halo Save" (if you haven't renamed them yourself).
Restoring a mash up pack world