Trouble in Terrorist Town (TTT) is a multiplayer gamemode included with Garry’s Mod. Set in a parody of the Counter-Strike universe, the game is about a group of “terrorists” who have traitors among them, out to kill everyone who’s not a traitor.

When the game starts, a small number of players is selected as Traitors, who have to kill all the Innocent players (ie. the rest of the players). The Innocent players know they are in the majority, but they do not know who is a Traitor and who is not.

The Traitors must use the element of surprise and their special equipment to their advantage in order to succeed. The Innocent just have to survive, which means finding out who the Traitors are and eliminating them first. This is complicated by the fact that everyone is wielding lethal weaponry, and everyone looks suspicious…

If you’ve heard of non-digital party games like Werewolf or Mafia, it’s a bit like that but on a computer and with guns.