Paranoia

A table-top role playing game designed to encourage improvisation and competitive (vs cooperative) role-playing, players live in the Alpha Complex, an underground city controlled by a computer and a color-coded hierarchy. Players are "trouble-shooters" (eg. "find trouble and shoot it"), tasked with ridding the complex of enemies such as secret societies and mutants. Of course, all players (and their 5 clones) are each members of secret societies and have mutant powers.