SilentPatch is a collection of Windows DLL plugins (ASI) for Grand Theft Auto III, Vice City, and San Andreas. It hooks into the game processes at runtime to apply hundreds of bug fixes, compatibility improvements, and optional enhancements without altering core gameplay. The patches are delivered as separate DLLs per game (SilentPatchIII.asi, SilentPatchVC.asi, SilentPatchSA.asi) plus a shared DirectDraw compatibility library (DDraw.dll). The code is organized per game with a common set of utilities for memory patching, pattern scanning, version detection, and mod interoperability. Entry points are DllMain functions that dispatch to version-specific patching routines, which use byte-pattern scanning and hardcoded offsets to locate and modify game code and data. The mod supports configuration via INI files and an optional debug menu, and it detects and cooperates with other popular mods like SkyGfx and Fastman92 limit adjuster. The project demonstrates deep reverse engineering of the game binaries and scripts, with fixes ranging from rendering glitches and input lag to mission-breaking bugs and restored PS2-era behavior.