High Quality Content by WIKIPEDIA articles! The Unreal Engine is a game engine developed by Epic Games. First illustrated in the 1998 first-person shooter game Unreal, it has been the basis of many games since, including Unreal Tournament, Deus Ex, Turok, Tom Clancy's Rainbow Six 3: Raven Shield, Tom Clancy's Rainbow Six: Vegas, America's Army, Red Steel, Gears of War, BioShock, BioShock 2, Tactical Ops: Assault on Terror, Mirror's Edge, Batman: Arkham Asylum, Section 8, and so forth.