If you legitimately own the game on Steam and want to experiment with the game files (often conflated with ROMs), here is how the structure works:
is a commercially sold product developed by SEGA. Downloading or distributing the game files (ROMs/ISOs) for this specific collection without purchasing it is piracy , which is illegal and violates copyright laws. sonic origins plus rom
The core games in Sonic Origins Plus are, of course, the main attraction. The collection includes: If you legitimately own the game on Steam