First Person Shooter
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From Diablo Wiki
The First Person Shooter game genre, often abbreviated FPS is based on a game where the player looks in to the game from the perspective of the character (or unit) he or she is playing. Traditionally, a player can see a weapon in the lower end of the screen, shooting enemy AI units, or opposing players.
Most FPS games use Friendly Fire, but some don't.
Classic examples of FPS games include Doom and Quake.