The London Underground has degenerated into a battleground with opposing gangs of dealers, pushers, punks and muggers fighting for supremacy over the city's key stations. You are the Subway Vigilante and it's your duty is to protect the law-abiding tube travellers and wipe out the rival gangs. Using the subway map to locate trouble hotspots, you then travel by train to confront the violent criminals in the stations. Once a station is cleared of bad guys, you can move on to another location to do your vigilante duty.