A PNACH (pronounced "patch") file is a specialized text document used exclusively by the PCSX2 emulator to inject cheats into a specific game. Unlike standard "game trainers," PNACH files function similarly to legacy hardware like Game Genie or Pro Action Replay, using hexadecimal codes to change game values in real-time. For , these files are commonly used for: Financial Boosts : Setting Master League cash to billions.

PNACH stands for . Unlike a traditional Action Replay or GameShark disc, PCSX2 uses a simple text file to apply cheats. When the emulator boots a game, it checks the CRC (Cyclic Redundancy Check) of your specific game disc image. If it finds a PNACH file matching that CRC in the cheats folder, it executes the codes.