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Shooter games are a subgenre of action game, which often test the player's speed and reaction time. It includes many subgenres that have the commonality of focusing on the actions of the avatar using some sort of weapon. Usually this weapon is a gun, try to get or some other long-range weapon. A common resource found in many shooter games is ammunition. Most commonly, the purpose of a shooter game is to shoot opponents and proceed through missions without the player character being killed or dying. A shooting game is a genre of video game where the player has limited spatial control of his or her character, and the focus is almost entirely on the defeat of the character's enemies using long-range weaponry.
There are many criteria to determine the type of shooter; listed below are some of the major divisions. Using the following, it is possible to categorize almost all shooters developed.
In a first-person shooter, the player usually views the events from a camera angle which simulates the character's point of view, while third-person shooters use a camera which follows the character and can often be controlled by the player. It is also possible for a game to have a fixed camera, especially shooting gallery games and some 2D overhead shooters such as Robotron 2084.
Tactical shooters are games that attempt to emulate lifelike ballistics and character damage, one example is Rainbow Six. Other shooter games range further away from realism and towards fantasy, like the Sci-Fi action shooting series titled Lost Planet.
While most shooters are played as solo ventures, several offer the players the opportunity to control a squad of characters, usually directly controlling one, and giving orders to computer-controlled allies. Games which feature non-player characters fighting alongside the player, but which are not directly controllable (either by switching player control, or issuing orders to the character) are not considered squad-based games.
If a shooter game is playable online, there are several other sharp divisions it can take. Many games will offer differing modes which allow players to choose from among various types, such as the following. In team modes, players are assigned to one of two (sometimes more, but very infrequently) factions which are competing for some goal. Co-op modes have several players on the same faction playing through either single-player or custom missions against computer-controlled enemies. Individual (often called deathmatch or free for all) has all players competing with each other.
This is often an optional way to categorize a shooter, but in some cases it's needed to help distinguish it. A game may quite often heavily rely on stealth as opposed to direct action. Others might have large horror elements to them. However, the one thing in common with all shooters is that combat with a gun or similar long range/projectile weapon is the primary focus of gameplay itself.
Shoot 'em ups are a specific subgenre of shooters wherein the player may move up and down and left and right around the screen, typically firing straight forward.
Shoot 'em ups share common gameplay, but are often categorized by viewpoint. This includes fixed shooters on fixed screens, such as Space Invaders and Galaxian; scrolling shooters that mainly scroll in a single direction, such as Xevious and Darius; top-down shooters (sometimes referred to as twin-stick shooters) where the levels are controlled from an overhead viewpoint, such as Bosconian and Time Pilot; rail shooters where player movement is automatically guided down a fixed forward-scrolling "rail", such as Buck Rogers: Planet of Zoom and Space Harrier; and isometric shooters which use an isometric perspective, such as Zaxxon and Viewpoint. This genre also includes "run and gun" games which emphasize greater maneuvering or even jumping, such as Thexder, Contra and Metal Slug.
Shooting gallery games include light gun games, although many can also be played using a regular joypad and an on-screen cursor to signify where the bullets are being aimed. When these debuted, they were typically played from a first-person perspective, with enemy fire that occurred anywhere on the screen damaging or killing the player. As they evolved away from the use of light guns, the player came to be represented by an on-screen avatar, usually someone on the bottom of the screen, who could move and avoid enemy attacks while returning fire. These sorts of shooters almost always utilize horizontal scrolling to the right to indicate level progression, with enemies appearing in waves from predestined locations in the background or from the sides. One of the earliest examples is the 1985 arcade game Shootout produced by Data East.
A specific subgenre of this type of game is the Cabal shooter, named for the game Cabal, in which the player controls an on-screen avatar that can run and often jump around the screen in addition to being able to aim their gun. Other games in this subgenre include Blood Bros., Dynamite Duke, NAM-1975, Wild Guns, and Sin and Punishment.
As light gun games became more prevalent and started to make use of fully 3D backgrounds, such as the Time Crisis or House of the Dead series, these sorts of games fell out of popular production, but many like Blood Bros. still have their fanbase today. Other notable games of this category include Operation Wolf and Laser Invasion.
Light gun shooters are shooting gallery games that use a pointing device for computers and a control device for arcade and video games. The first light guns appeared in the 1930s, following the development of light-sensing vacuum tubes. It was not long before the technology began appearing in arcade shooting games, beginning with the Seeburg Ray-O-Lite in 1936. These early light gun games used small targets (usually moving) onto which a light-sensing tube was mounted; the player used a gun (usually a rifle) that emitted a beam of light when the trigger was pulled. If the beam struck the target, a "hit" was scored. Modern screen-based light guns work on the opposite principle--the sensor is built into the gun itself, and the on-screen target(s) emit light rather than the gun. The first light gun of this type was used on the MIT Whirlwind computer, which used a similar light pen. Like rail shooters, movement is typically limited in light-gun games.
Notable games of this category include the 1974 and 1984 versions of Wild Gunman, Duck Hunt for the NES, the Virtua Cop series, Time Crisis series, House of the Dead series, and Resident Evil: The Umbrella Chronicles & Darkside Chronicles.
First-person shooters are characterized by an on-screen view that simulates the in-game character's point of view. While many rail shooters and light-gun shooters also use a first-person perspective, they are generally not included in this category.
Notable examples of the genre include Doom, Quake, Half-Life, Counter-Strike, GoldenEye 007, Battlefield, Medal of Honor, Unreal, Call of Duty, Killzone, TimeSplitters, Team Fortress 2, Halo, and Destiny.
Third-person shooters are characterized by a third-person camera view that fully displays the player character in his/her surroundings. Notable examples of the genre include the Tomb Raider series, Syphon Filter, Max Payne, SOCOM, Star Wars: Battlefront, Resident Evil 4, Gears of War, and Splatoon. Third person shooter mechanics are often incorporated into open-world adventure and sandbox games, including the Elder Scrolls series and the Grand Theft Auto franchise.
Hero shooters are a variation of multiplayer first- or third-person arena-based shooters, where players, split among two or more teams, select from pre-designed "hero" characters that each possess unique attributes, skills, weapons, and other activated abilities; players may gain abilities to customize the appearance of these characters, but these changes are usually cosmetic only and do not alter the game's balance. Hero shooters strongly encourage teamwork between players on a team, guiding players to select effective combinations of hero characters and coordinate the use of hero abilities during a match. Such games are inspired by multiplayer online battle arena games. A popular team-based shooter that is considered one of the first Hero Shooters is Team Fortress 2. Other examples of hero shooters include Overwatch, Gigantic, Paladins and Quake Champions. Hero Shooters are considered to have strong potential as eSports competitive titles. 
Tactical shooters are shooters that generally simulate realistic squad-based or man-to-man skirmishes. Notable examples of the genre include Ubisoft's Tom Clancy's Rainbow Six and Ghost Recon series and Bohemia Software's Operation Flashpoint.
A Battle Royale shooter is a game with similarities to a survival game with the exception of it being player verses player, the end goal being to be the last one to survive. A typical Battle Royale shooter will include a large map that is surrounded by a hazardous fog that gets encloses more and more as the match goes on, while players go around the map searching for weapons and gear that will provide them with greater advantages.
Shooter games have been accused of glorifying and promoting violence and several games have been the cause of notable video game controversies. After school shootings in Erfurt, Emsdetten and Winnenden, German conservative politicians accused violent shooter games, most notably Counter Strike, to incite young gamers to run amok. Several attempts were made to banish the so termed "Killerspiele" (killing games) in Germany and the European Union. Shooter games were further criticised when Anders Breivik, perpetrator of the 2011 Norway attacks, claimed that he developed target acquisition skills by playing Call of Duty: Modern Warfare.