You want the .CSO extension. This is the "highly compressed" native format for PSP. A standard .ISO might be 1GB. A .CSO of the same game could be 300MB. PPSSPP runs CSOs perfectly, though load times might increase by 1-2 seconds.
In 2024-2025, you might wonder why you wouldn't just play the official Attack on Titan 2: Final Battle on Switch or PC. Here is the appeal of the PSP version: attack on titan psp highly compressed
In the world of ROMs and ISOs, "highly compressed" refers to a file that has been reduced from its original size (often 800MB to 1.5GB) down to a fraction of that (100MB to 300MB). This is achieved by: You want the
For a game like Attack on Titan, which features hundreds of on-screen enemies (Titans) and fast 3D maneuvering, compression is an art form. A successful "highly compressed" rip maintains the core 3D maneuver gear mechanics while gutting unnecessary localization files (like unneeded language packs). For a game like Attack on Titan ,
| Option | Platform | How to Get | Size | Quality | |--------|----------|------------|------|---------| | Attack on Titan 2 | Nintendo Switch | Official cartridge / eShop | ~8 GB | Excellent | | Attack on Titan (2016) | PS Vita (official) | PSN or physical cart (used) | ~1.5 GB | Very good | | Attack on Titan Tribute Game | PC (Windows/Mac/Linux) + Steam Deck | Free download from fan site | ~200 MB | Good (fan-made) | | Remote Play | PSP → PS3/PS4 | Stream official game from PS3/PS4 to PSP | N/A | Laggy, but possible |
Note: PSP can remote play PS3/PS4 games, but Attack on Titan requires analog sticks and triggers – PSP’s single analog nub makes control mapping difficult.