If you own a copy of the game but want to play it without swapping discs, or if you are using a backup, here is the standard process:
Because God of War III was distributed on a high-capacity Blu-ray disc, it is technically referred to as an or a PS3 Game Folder (JB Folder structure) rather than a traditional ROM. Due to the massive amount of uncompressed textures, high-quality audio, and cinematic files, the God of War III ISO is exceptionally large, often exceeding 35 GB to 40 GB. Emulating God of War III: The RPCS3 Revolution God of War III ROM -ISO- Download per Sony Play...