If you are comparing the standard Origins ROM to the Plus ROM, here is what changes:
For Sonic fans and retro gaming enthusiasts, Sonic Origins Plus and the world of Switch ROMs offer a chance to relive the excitement of Sonic's early adventures. As we look to the future, the legacy of Sonic and the innovation of gaming platforms like the Switch ensure that the blue blur's speedy escapades will continue to thrill gamers for generations to come.
Platformer, Classic Game Collection
: Features previously paid content like "Extreme Missions," "Mirror Mode," and additional music tracks from other Sonic titles. The Game Library: From Genesis to Game Gear