There are two primary reasons why a 200MB God of War III file for PPSSPP is impossible:

Assuming you have legally obtained a copy of Ghost of Sparta or Chains of Olympus , here is the optimal setup to make them run at full speed—even on mid-range phones.

The original God of War III utilized approximately 35GB of Blu-ray disc space. Compressing 35GB of high-definition assets into a 200MB 7z file is technically impossible without losing nearly all the game’s data. What These Files Actually Are

If you download a highly compressed "rip" file (Type A) that claims to work:

God of War III, an action-adventure game developed by Santa Monica Studio, was initially released for the PlayStation 3 console in 2010. The game received widespread critical acclaim for its engaging gameplay, stunning graphics, and intense storyline. However, for those who want to experience this iconic game on-the-go, a PPSSPP (PlayStation Portable Simulator for PSP and other devices) version has been made available.