To use a , you essentially use it as a "pre-boot" disc that patches the console's memory with cheats before you launch your actual game ISO. How to Use Code Breaker on PCSX2

The format is a digital image file of the original Code Breaker disc. It is highly valued today because it can be used on:

This is an open-source homebrew game enhancer for PS2, similar to Action Replay and Code Breaker, with ongoing community development. It supports EXFAT USB devices and can load cheats from PFS partitions on internal HDDs.