All “highly compressed” versions are either:

projects. Some developers built AoT engines from scratch specifically for the PSP hardware. 🚀 How to Play It Today

The phenomenon is a unique intersection of anime fandom and emulator culture. While there was never an official Attack on Titan (Shingeki no Kyojin) release specifically for the Sony PlayStation Portable (PSP) hardware, the community has filled this gap through clever mods , fan games , and highly compressed mobile ports designed to run on the PPSSPP Gold emulator. The Quest for "Highly Compressed" Files

He was in an alley.