The "patched ISO" files found online are typically fan-made mods of other PSP racing games (such as Test Drive Unlimited or Gran Turismo ) that have been visually modified with Forza-themed textures, menus, and car models. The Reality of Forza Horizon 4 on PPSSPP
: Most "Forza Horizon 4 PPSSPP" files are actually mods of Test Drive Unlimited . While they may feature updated menus and Forza-style car textures, the core physics and world remain those of the original PSP title.
: Forza Horizon 4 is officially available only on Microsoft Store and was previously on Steam before being delisted in December 2024.