GTA: Underground is a global modification built on the GTA San Andreas game engine and combines all three maps of the past parts of GTA namely: GTA Vice City, GTA 3 and of course GTA Sa. In all three cities there are operating shops, you can buy a house, and there is also the possibility of capturing territories in all three cities. Each city has its own characters. From each city you can fly to another from the airport and many other possibilities...