The version is a fan-made repack (not official). It uses compression techniques (CSO compression, audio downscaling, or video re-encoding) to shrink the original ~1.2 GB ISO down to 200–400 MB , while claiming to preserve graphics, frame rate, and audio.
Wait, perhaps they are looking for a guide on compressing the game to make it smaller for transfer or storage, especially with emulator use. The user might be using an emulator like PPSSPP and wants to save space. High quality might refer to ensuring that the game runs well even with the compressed file, without glitches or performance issues. attack on titan psp highly compressed high quality
highly compressed high quality" download, you’ve likely encountered a mix of nostalgic fan projects and confusing listings. While the PlayStation Portable (PSP) never saw an official Attack on Titan release from Koei Tecmo The version is a fan-made repack (not official)