There is no official version of Grand Theft Auto III (GTA 3) released for the PSP (PlayStation Portable), which means it cannot be run natively on the PPSSPP emulator
Navigate to the tab and browse to your "PSP Games" folder. Click the GTA 3 icon to start the game! Best PPSSPP Settings for GTA 3 Download Gta 3 Ppsspp Android
While there was never an official release of Grand Theft Auto III There is no official version of Grand Theft