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First-person shooter (FPS) is a sub-genre of shooter video games centered on gun and other weapon-based combat in a first-person perspective, with the player experiencing the action through the eyes of the protagonist and controlling the player character in a three-dimensional space. The genre shares common traits with other shooter games, and in turn falls under the action game genre. Since the genre's inception, advanced 3D and pseudo-3D graphics have challenged hardware development, and multiplayer gaming has been integral.
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The first-person shooter genre has been traced back to Wolfenstein 3D (1992), which has been credited with creating the genre's basic archetype upon which subsequent titles were based. One such title, and the progenitor of the genre's wider mainstream acceptance and popularity, was Doom (1993), often considered the most influential game in this genre; for some years, the term Doom clone was used to designate this genre due to Doom's influence. Corridor shooter was another common name for the genre in its early years, since processing limitations of the era's hardware meant that most of the action in the games had to take place in enclosed areas, such as in cramped spaces like corridors and tunnels.
1998's Half-Life—along with its 2004 sequel Half-Life 2—enhanced the narrative and puzzle elements. In 1999, the Half-Life mod Counter-Strike was released and, together with Doom, is perhaps one of the most influential first-person shooters. GoldenEye 007, released in 1997, was a landmark first-person shooter for home consoles, while the Halo series heightened the console's commercial and critical appeal as a platform for first-person shooter titles. In the 21st century, the first-person shooter is the most commercially viable video game genre, and in 2016, shooters accounted for over 27% of all video game sales.