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, Borderlands, Destroy All Humans! Path of the Furon, Mirror's Edge, Batman: Arkham Asylum, Section 8, and so forth. Although primarily developed for first-person shooters, it has been successfully used in a variety of genres, including stealth , MMORPG s well as RPGs with Mass Effect, The Last Remnant, and Harry Potter and the Philosopher's Stone.