If you are playing on a mobile device or a handheld like the Steam Deck or Anbernic, storage space is a premium.

A "highly compressed" ISO is a version of the game file that has been shrunk using specific compression algorithms or by removing non-essential data. While the original game is roughly , highly compressed versions can range from 2 GB down to as low as 500 MB (in extreme "RIP" cases). How Compression Works:

Ensure you have the PS2 BIOS files placed in your emulator’s BIOS folder.

Removing "padding" data that developers used to fill space on the physical disc.