Use an extraction tool like ZArchiver (Android) or 7-Zip (PC).

On a physical PSP, if a game shows as "corrupted," enter Recovery Mode (hold R while turning on) and ensure your UMD Mode is set to "M33 Driver" or "Sony NP9660" . 3. Performance Fix: Convert CSO to ISO

The most common reason a highly compressed game won't load is that it’s still inside a container file like 7-Zip or RAR .

In PPSSPP, go to Settings > System > Emulation and check the box for "Ignore bad memory accesses" . This often prevents the emulator from crashing when a compressed file has minor read errors.

While CSO files save space, they can cause lag and stuttering because the CPU has to decompress data on the fly.

Highly compressed games can sometimes struggle with data streaming, leading to crashes or blue screens.

If you want legitimate low-size experiences that don't require extreme (and often buggy) compression, try these titles: Size (Approx.) 35MB Simulation Tomb Raider II Action-Adventure Lumines Rock Man 2/3 Platformer 5. Optimized PPSSPP Settings for Compressed Games

If your game isn't working, follow this guide to fix it and optimize your PPSSPP emulator for low-size gaming.

Searching for "highly compressed PSP games under 200MB" is a popular way to save storage, but it often leads to errors like "Could not load game" or constant crashing. Highly compressed games are typically standard ISO files wrapped in .7z , .rar , or .zip archives, or converted into specialized formats like CSO (Compressed ISO) .

Extract the file until you see a .iso or .cso file. These are the only formats the PPSSPP emulator can read directly. 2. Fix "Invalid Memory Access" & Crashes