| Feature | Original UMD | Highly Compressed ISO (CSO, Level 9) | | :--- | :--- | :--- | | | 1.1 GB | 180 - 300 MB | | Load Times | 4-7 seconds | 2-4 seconds (PSP) / <1 sec (PPSSPP) | | FMV Quality | 100% original | 85-90% (slight blocking in dark scenes) | | Compatibility | All PSP models | Needs CFW or Emulator | | Portability | Carry UMD disc | Stored on Memory Stick (no swapping) | | Save States | No | Yes (via CFW/Emulator) |
There is no verified "exclusive" version of this game in a highly compressed format. The term is likely used for marketing on file-sharing or ROM sites. tomb raider underworld psp iso highly compressed exclusive