I'd say there would be a massive specification difference. - GTA3, GTAVC, GTASA were designed for the PS2/Xbox. GTAIV is designed for the next gen PS3/Xbox360. - GTA3, GTAVC, GTASA all run on the same game engine. GTAIV runs on 'RAGE'. - GTA3, GTAVC, GTASA all had simple physics and animation. GTAIV...