FPS is an acronym for “first person shooter” as well as “frames per second,” so context is fairly important here. The FPS (first person shooter) genre of games is a common genre that has evolved as a subset of 3D gaming. It typically is a three-dimensional representation of a one-versus-many conflict involving mazes and simple puzzles such as “find the key” or “get the information.” It's a shooter in that it often involves gunplay, and the guns actually serve as a form of “problem-solving implement.” Your obstacle can be anything from zombies, to evil Nazis, or even mere barrels that explode when you shoot them.