To get GTA 3 working, you must have a jailbroken Vita with specific plugins and files installed: :
: The game is stable, with the option to overclock the Vita to 444 MHz or 500 MHz for even better performance. gta 3 vpk ps vita work
, bring remastered-style lighting and assets to the Vita hardware. Essential Plugins To get GTA 3 working, you must have