Shoot 'em up
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Shoot 'em ups (also known as shmups or STGs) are a sub-genre of shooter video games, which are in turn a sub-genre of action video games. There is no consensus as to which design elements compose a shoot 'em up; some restrict the definition to games featuring spacecraft and certain types of character movement, while others allow a broader definition including characters on foot and a variety of perspectives.
The genre's roots can be traced back to earlier shooting games, including target shooting electro-mechanical games of the mid-20th-century and the early mainframe game Spacewar! (1962). The shoot 'em up genre was established by the hit arcade game Space Invaders, which popularised and set the general template for the genre in 1978, and spawned many clones. The genre was then further developed by arcade hits such as Asteroids and Galaxian in 1979. Shoot 'em ups were popular throughout the 1980s to early 1990s, diversifying into a variety of subgenres such as scrolling shooters, run-and-gun games and rail shooters. In the mid-1990s, shoot 'em ups became a niche genre based on design conventions established in the 1980s, and increasingly catered to specialist enthusiasts, particularly in Japan. "Bullet hell" games are a subgenre of shooters that features overwhelming numbers of enemy projectiles, often in visually impressive formations.
A "shoot 'em up", also known as a "shmup" or "STG" (the common Japanese abbreviation for "shooting games"), is a game in which the protagonist combats a large number of enemies by shooting at them while dodging their fire. The controlling player must rely primarily on reaction times to succeed. Beyond this, critics differ on exactly which design elements constitute a shoot 'em up. Some restrict the genre to games featuring some kind of craft, using fixed or scrolling movement. Others widen the scope to include games featuring such protagonists as robots or humans on foot, as well as including games featuring "on-rails" (or "into the screen") and "run and gun" movement. Mark Wolf restricts the definition to games featuring multiple antagonists ("'em" being short for "them"), calling games featuring one-on-one shooting "combat games". Formerly, critics described any game where the primary design element was shooting as a "shoot 'em up", but later shoot 'em ups became a specific, inward-looking genre based on design conventions established in those shooting games of the 1980s.
Shoot 'em ups are a subgenre of shooter game, in turn a type of action game. These games are usually viewed from a top-down or side-view perspective, and players must use ranged weapons to take action at a distance. The player's avatar is typically a vehicle or spacecraft under constant attack. Thus, the player's goal is to shoot as quickly as possible at anything that moves or threatens them to reach the end of the level with a boss battle. In some games, the player's character can withstand some damage or a single hit will result in their destruction. The main skills required in shoot 'em ups are fast reactions and memorising enemy attack patterns. Some games feature overwhelming numbers of enemy projectiles and the player has to memorise their patterns to survive. These games belong to one of the fastest-paced video game genres.
Large numbers of enemy characters programmed to behave in an easily predictable manner are typically featured. These enemies may behave in a certain way dependent on their type, or attack in formations that the player can learn to predict. The basic gameplay tends to be straightforward with many varieties of weapons. Shoot 'em ups rarely have realistic physics. Characters can instantly change direction with no inertia, and projectiles move in a straight line at constant speeds. The player's character can collect "power-ups" which may afford the character's greater protection, an "extra life", health, shield, or upgraded weaponry. Different weapons are often suited to different enemies, but these games seldom keep track of ammunition. As such, players tend to fire indiscriminately, and their weapons only damage legitimate targets.
Shoot 'em ups are categorized by their design elements, particularly viewpoint and movement:
Fixed shooters restrict the player along with enemies to a single screen; this can also include giving them a single axis of motion. Everything including movement is constrained to one screen. Examples include Space Invaders (1978), Galaxian (1979), Centipede (1980), Galaga (1981), Pooyan (1982), Galactix (1992), Love Hero (2019), and Doughlings: Invasion (2019).
Multidirectional shooters feature 360-degree movement where the protagonist may rotate and move in any direction. Multidirectional shooters with one joystick for movement and one joystick for firing in any direction independent of movement are called twin-stick shooters. One of the first examples of a twin-stick shooter is Robotron: 2084 (1982)
Space shooters involve piloting spacecraft in an outer space setting. Following the success of Space Invaders, space shooters were the dominant subgenre during the late 1970s to early 1980s. These games can overlap with other subgenres as well as space combat games.
Rail shooters limit the player to moving around the screen while following a specific route; these games often feature an "into the screen" viewpoint, with which the action is seen from behind the player character, and moves "into the screen", while the player retains control over dodging. Examples include Space Harrier (1985), Captain Skyhawk (1990), Starblade (1991), Star Fox (1993), Star Wars: Rebel Assault (1993), Panzer Dragoon (1995), and Sin and Punishment (2000). Rail shooters that use light guns are called light gun shooters, such as Virtua Cop (1994), Time Crisis (1995) and The House of the Dead (1996). Light-gun games that are "on rails" are usually not considered to be in the shoot-em-up category, but rather their own first-person light-gun shooter category.
Cute 'em ups feature brightly colored graphics depicting surreal settings and enemies. Cute 'em ups tend to have unusual, oftentimes completely bizarre opponents for the player to fight, with Twinbee and Fantasy Zone first pioneering the subgenre, along with Parodius, Cotton, and Harmful Park being additional key games. Some cute 'em ups may employ overtly sexual characters and innuendo.
Run 'n' gun or run and gun games have protagonists that fight on foot, often with the ability to jump. Examples include Commando, Ikari Warriors, Contra, Metal Slug and Cuphead. Run-and-gun games may use side scrolling, vertical scrolling or isometric viewpoints and may feature multidirectional movement.
Bullet hell (弾幕, danmaku, literally "barrage" or "bullet curtain") is a subgenre of shooters in which the entire screen is often almost completely filled with enemy bullets. This type is also known as "curtain fire", "manic shooters" or "maniac shooters". This style of game originated in the mid-1990s as an offshoot of scrolling shooters.
A small subgenre of shooter games that emphasizes chaotic, reflex-based gameplay designed to put the player in a trance-like state. In trance shooters, enemy patterns usually have randomized elements, forcing the player to rely on reflexes rather than pattern memorization. Games of this type usually feature colorful, abstract visuals, and electronic music (often techno music). Jeff Minter is commonly credited with originating the style with Tempest 2000, and Minter developed a number of other notable examples, including Space Giraffe, Gridrunner++, and Polybius (2017). Other notable examples include the Geometry Wars series, Space Invaders Extreme, Super Stardust HD and Resogun.
The concept of shooting games existed before video games, dating back to shooting gallery carnival games in the late 19th century. Mechanical target shooting games first appeared in England's amusement arcades around the turn of the 20th century, before appearing in America by the 1920s. Shooting gallery games eventually evolved into more sophisticated target shooting electro-mechanical games (EM games) such as Sega's influential Periscope (1965). Shooting video games have roots in EM shooting games.
Video game journalist Brian Ashcraft argues that Spacewar! (1962), an early mainframe game, was the first shoot 'em up video game. It was developed at the Massachusetts Institute of Technology in 1961, for the developers' amusement. It was remade four times as an arcade game during the early to mid-1970s. It featured combat between two spacecraft.
Emergence of shoot 'em up genre (late 1970s)
Space Invaders (1978) is most frequently cited as the "first" or "original" in the genre. A seminal game created by Tomohiro Nishikado of Japan's Taito, it led to shooter games becoming prolific. It pitted the player against multiple enemies descending from the top of the screen at a constantly increasing speed. Nishikado conceived the game by combining elements of Breakout (1976) with those of earlier target shooting games, and simple alien creatures inspired by H. G. Wells' The War of the Worlds. The hardware was unable to render the movement of aircraft, so the game was set in space, with a black background. It had a more interactive style of play than earlier target shooting games, with multiple enemies who responded to the player-controlled cannon's movement and fired back at the player. The game ended when the player was killed by the enemies. While earlier shooting games allowed the player to shoot at targets, Space Invaders was the first where multiple enemies fired back at the player. It also introduced the idea of giving the player multiple lives and popularized the concept of achieving a high score
With these elements, Space Invaders set the general template for the shoot 'em up genre. It became one of the most widely cloned shooting games, spawning more than 100 imitators with only the most minor differences (if any) from the original. Most shooting games released since then have followed its "multiple life, progressively difficult level" paradigm, according to Eugene Jarvis.
Golden age and refinement (late 1970s to early 1980s)
Following the success of Space Invaders, shoot 'em ups became the dominant genre for much of the golden age of arcade video games, from the late 1970s up until the early 1980s, particularly the "space shooter" subgenre. In 1979, Namco's Galaxian—"the granddaddy of all top-down shooters", according to IGN—was released. Its use of colour graphics and individualised antagonists were considered "strong evolutionary concepts" among space ship games. Atari's Asteroids (1979) was a hit multi-directional shooter, allowing the player to shoot in any direction by rotating the game's spacecraft.
The Space Invaders format evolved into the vertical scrolling shooter sub-genre. SNK's debut shoot 'em up Ozma Wars (1979) featured vertical scrolling backgrounds and enemies, and it was the first action game to feature a supply of energy, similar to hit points. Namco's Xevious, released in 1982, was one of the first and most influential vertical scrolling shooters. Xevious is also the first to convincingly portray dithered/shaded organic landscapes as opposed to blocks-in-space or wireframe obstacles.
Side-scrolling shoot 'em ups emerged in the early 1980s. Defender, introduced by Williams Electronics in late 1980 and entering production in early 1981, allowed side-scrolling in both directions in a wrap-around game world, unlike most later games in the genre. The scrolling helped remove design limitations associated with the screen, and it also featured a minimap radar. Scramble, released by Konami in early 1981, had continuous scrolling in a single direction and was the first side-scrolling shooter with multiple distinct levels.
In the early 1980s, Japanese arcade developers began moving away from space shooters towards character action games, whereas American arcade developers continued to focus on space shooters during the early 1980s, up until the end of the arcade golden age. According to Eugene Jarvis, American developers were greatly influenced by Japanese space shooters but took the genre in a different direction from the "more deterministic, scripted, pattern-type" gameplay of Japanese games, towards a more "programmer-centric design culture, emphasizing algorithmic generation of backgrounds and enemy dispatch" and "an emphasis on random-event generation, particle-effect explosions and physics" as seen in arcade games such as his own Defender and Robotron: 2084 (1982) as well as Atari's Asteroids (1979). Robotron: 2084 was an influential game in the multi-directional shooter subgenre.
Some games experimented with pseudo-3D perspectives at the time. Nintendo's attempt at the genre, Radar Scope (1980), borrowed heavily from Space Invaders and Galaxian, but added a three-dimensional third-person perspective; the game was a commercial failure, however. Atari's Tempest (1981) was one of the earliest tube shooters and a more successful attempt to incorporate a 3D perspective into shooter games; Tempest went on to influence several later rail shooters. Sega's Zaxxon (1981) introduced isometric video game graphics to the genre.
The term "shmup" is believed to have been coined in 1985 by the British Commodore 64 magazine Zzap!64. In the July 1985 issue, the term was used by the editor Chris Anderson and reviewer Julian Rignall.
1985 saw the release of Konami's Gradius, which gave the player greater control over the choice of weaponry, thus introducing another element of strategy. The game also introduced the need for the player to memorise levels in order to achieve any measure of success. Gradius, with its iconic protagonist, defined the side-scrolling shoot 'em up and spawned a series spanning several sequels. The following year saw the emergence of one of Sega's forefront series with its game Fantasy Zone. The game received acclaim for its surreal graphics and setting and the protagonist, Opa-Opa, was for a time considered Sega's mascot. The game borrowed Defender's device of allowing the player to control the direction of flight and along with the earlier TwinBee (1985), is an early archetype of the "cute 'em up" subgenre. In 1986, Taito released KiKi KaiKai, an overhead multi-directional shooter. The game is notable for using a traditional fantasy setting in contrast to most shoot 'em up games filled with science fiction motifs. R-Type, an acclaimed side-scrolling shoot 'em up, was released in 1987 by Irem, employing slower paced scrolling than usual, with difficult, claustrophobic levels calling for methodical strategies. 1990's Raiden was the beginning of another acclaimed and enduring series to emerge from this period.
Run-and-gun and rail shooters (1980s to early 1990s)
Run-and-gun shoot 'em ups became popular in the mid-1980s. These games feature characters on foot, rather than spacecraft, and often have military themes. The origins of this type of shooter go back to Sheriff by Nintendo, released in 1979. SNK's Sasuke vs. Commander (1980), which had relatively detailed background graphics for its time, pit a samurai against a horde of ninjas, along with boss fights. Taito's Front Line (1982) introduced the vertical scrolling format later popularized by Capcom's Commando (1985), which established the standard formula used by later run-and-gun shooters. Sega's Ninja Princess (1985), which released slightly before Commando, was a run-and-gun shooter that was distinctive for its feudal Japan setting and female ninja protagonist who throws shuriken and knives. SNK's TNK III, released later in 1985, combined the Front Line tank shooter format with unique rotary joystick controls, which they later combined with Commando-inspired run-and-gun gameplay to develop Ikari Warriors (1986), which further popularized run-and-gun shooters. Ikari Warriors also drew inspiration from the action film Rambo: First Blood Part II (1985), which it was originally intended to be an adaptation of. Contemporary critics considered military themes and protagonists similar to Rambo or Schwarzenegger prerequisites for a shoot 'em up, as opposed to an action-adventure game. The success of Commando and Ikari Warriors led to run-and-gun games becoming the dominant style of shoot 'em up during the late 1980s to early 1990s, with the term "shoot 'em up" itself becoming synonymous with run-and-gun shooters during this period.
Konami's Green Beret (1985), known as Rush'n Attack in North America, adapted the Commando formula to a side-scrolling format. Later notable side-scrolling run-and-gun shooters include Namco's Rolling Thunder (1986), which added cover mechanics to the formula, and Data East's RoboCop (1988). In 1987, Konami created Contra, a side-scrolling coin-op arcade game, and later a NES game, that was particularly acclaimed for its multi-directional aiming and two-player cooperative gameplay. By the early 1990s and the popularity of 16-bit consoles, the scrolling shooter genre was overcrowded, with developers struggling to make their games stand out, with exceptions such as the inventive Gunstar Heroes (1993) by Treasure.
Sega's pseudo-3D rail shooter Buck Rogers: Planet of Zoom demonstrated the potential of 3D shoot 'em up gameplay in 1982. Sega's Space Harrier, a rail shooter released in 1985, broke new ground graphically and its wide variety of settings across multiple levels gave players more to aim for than high scores. In 1986, Arsys Software released WiBArm, a shooter that switched between a 2D side-scrolling view in outdoor areas to a fully 3D polygonal third-person perspective inside buildings, while bosses were fought in an arena-style 2D battle, with the game featuring a variety of weapons and equipment. In 1987, Square's 3-D WorldRunner was an early stereoscopic 3-D shooter played from a third-person perspective, followed later that year by its sequel JJ, and the following year by Space Harrier 3-D which used the SegaScope 3-D shutter glasses. That same year, Sega's Thunder Blade switched between both a top-down view and a third-person view, and featured the use of force feedback, where the joystick vibrates.
Bullet hell and niche appeal (mid-1990s to present)
This article needs to be updated.(August 2017)
A new type of shooters up emerged in the early 1990s: variously termed "bullet hell", "manic shooters", "maniac shooters" and danmaku (弾幕, "barrage"), these games required the player to dodge overwhelming numbers of enemy projectiles and called for still more consistent reactions from players. Bullet hell games arose from the need for 2D shoot 'em up developers to compete with the emerging popularity of 3D games: huge numbers of missiles on screen were intended to impress players. Toaplan's Batsugun (1993) provided the prototypical template for this new breed, with Cave (formed by former employees of Toaplan, including Batsugun's main creator Tsuneki Ikeda, after the latter company collapsed) inventing the type proper with 1995's DonPachi. Bullet hell games marked another point where the shooter genre began to cater to more dedicated players. Games such as Gradius had been more difficult than Space Invaders or Xevious, but bullet hell games were yet more inward-looking and aimed at dedicated fans of the genre looking for greater challenges. While shooter games featuring protagonists on foot largely moved to 3D-based genres, popular, long-running series such as Contra and Metal Slug continued to receive new sequels. Rail shooters have rarely been released in the new millennium, with only Rez and Panzer Dragoon Orta achieving cult recognition.
Treasure's shoot 'em up, Radiant Silvergun (1998), introduced an element of narrative to the genre. It was critically acclaimed for its refined design, though it was not released outside Japan and remains a much sought-after collector's item. Its successor Ikaruga (2001) featured improved graphics and was again acclaimed as one of the best games in the genre. Both Radiant Silvergun and Ikaruga were later released on Xbox Live Arcade. The Touhou Project series spans 23 years and 27 games as of 2019 and was listed in the Guinness World Records in October 2010 for being the "most prolific fan-made shooter series". The genre has undergone something of a resurgence with the release of the Xbox 360, PlayStation 3 and Wii online services, while in Japan arcade shoot 'em ups retain a deep-rooted niche popularity. Geometry Wars: Retro Evolved was released on Xbox Live Arcade in 2005 and in particular stood out from the various re-releases and casual games available on the service. The PC has also seen its share of dōjin shoot 'em ups like Crimzon Clover, Jamestown: Legend of the Lost Colony, Xenoslaive Overdrive, and the eXceed series. However, despite the genre's continued appeal to an enthusiastic niche of players, shoot 'em up developers are increasingly embattled financially by the power of home consoles and their attendant genres.
- Davies, Jonti (30 July 2008). "The Shooting Never Stops". GameSpy. Archived from the original on 2012-04-02.
- Carless, Simon (5 April 2011). "Final Form On Jamestown's Origins, Mechanics". Game Set Watch. Archived from the original on 2011-09-08.
- Buchanan, Levi, Top 10 Classic Shoot 'Em Ups Archived 2012-02-16 at the Wayback Machine , IGN, April 8, 2008, May 26, 2009
- Beck, Ian (May 19, 2006). "Jets'n'Guns". Inside Mac Games. Archived from the original on December 6, 2008. Retrieved July 20, 2008.
- Ashcraft, p. 70
- Bielby, Matt, "The Complete YS Guide to Shoot 'Em Ups", Your Sinclair, July, 1990 (issue 55), p. 33
- Game Genres: Shmups, Professor Jim Whitehead, January 29, 2007. Retrieved June 17, 2008. Archived 2013-06-17 at the Wayback Machine
- Provo, Frank, Bloody Wolf Archived 2008-12-12 at the Wayback Machine , GameSpot, July 7, 2007. Accessed June 17, 2008
- Mark J. P. Wolf (2008). The video game explosion: a history from PONG to PlayStation and beyond. ABC-CLIO. p. 272. ISBN 978-0-313-33868-7. Archived from the original on 2012-11-14. Retrieved 2011-04-10.
- Rollings, Andrew; Ernest Adams (2006). Fundamentals of Game Design. Prentice Hall. Archived from the original on 2009-02-17.
- Kraig Kujawa; Sushi-X (October 1997). "Straight Shooters: When Dumb is More Fun". Electronic Gaming Monthly. No. 99. Ziff Davis. p. 84.
- Parkin, Simon (September 21, 2006). "Gradius Collection". Eurogamer. Archived from the original on July 3, 2009. Retrieved February 14, 2009.
- Provo, Frank (August 10, 2007). "Galaga '90". GameSpot. Archived from the original on 2008-12-12. Retrieved June 17, 2008.
- Onyett, Charles (February 13, 2006). "Crystal Quest". IGN. Archived from the original on July 22, 2016. Retrieved June 17, 2008.
- McAllister, Graham (March 30, 2011). "A Guide To iOS Twin Stick Shooter Usability". Gamasutra. Think Services. Archived from the original on April 25, 2014. Retrieved March 5, 2014.
- Yin-Poole, Wesley (December 9, 2013). "Microsoft's ID@Xbox policy means this indie twin-stick shooter can't launch on Xbox One". Eurogamer. Gamer Network. Archived from the original on March 5, 2014. Retrieved March 5, 2014.
- Thorpe, Nick (March 2014). "The 80s: The Golden Age of the Arcade". Retro Gamer. No. 127. pp. 28–31.
- Reed, Kristan, Gyruss Archived 2009-08-05 at the Wayback Machine , Eurogamer, April 19, 2007. Accessed February 17, 2009
- Goldstein, Hilary, Panzer Dragoon Orta Archived 2009-03-07 at the Wayback Machine, IGN, January 10, 2003; July 17, 2008
- Kalata, Kurt, "Space Harrier", Hardcore Gaming 101. Accessed February 02, 2010
- Ashcraft, Brian (2008). Arcade Mania! The Turbo Charged World of Japan's Game Centers. Kodansha International. p. 147.
- Kalata, Kurt. "Fantasy Zone – Hardcore Gaming 101". Retrieved 8 March 2021.
- "The Complete Guide... Shoot Em Ups". Retro Gamer. No. 42. September 2007. p. 52.
- Ashcraft, p. 82
- Smith, Rachael, "Sidewize", Your Sinclair, October 1987 (issue 22), p. 38
- Provo, Frank, Bloody Wolf Archived 2008-12-12 at the Wayback Machine, GameSpot, July 7, 2007. Accessed June 17, 2008
- Dunham, Jeremy, First Look: Alien Hominid Archived 2008-12-24 at the Wayback Machine, IGN, July 27, 2004. Accessed June 17, 2008
- Bielby, Matt, "The YS Complete Guide To Shoot-'em-ups Part II", Your Sinclair, August 1990 (issue 56), p. 19
- Ashcraft, p. 66
- Sheffield, Brandon, Q&A: Capcom's Kujawa On Revisiting Classics, Bullet Hell Archived 2008-06-23 at the Wayback Machine , Gamasutra, April 22, 2008. Accessed March 2, 2009
- Ashcraft, p. 77
- Voorhees, Gerald (2014). "Chapter 31: Shooting". In Perron, Bernard (ed.). The Routledge Companion to Video Game Studies. Taylor & Francis. pp. 251–258. ISBN 9781136290503.
- Williams, Andrew (16 March 2017). History of Digital Games: Developments in Art, Design and Interaction. CRC Press. p. 10. ISBN 978-1-317-50381-1.
- Ashcraft, Brian (2008), Arcade Mania! The Turbo Charged World of Japan's Game Centers, Kodansha International, p. 145
- Williams, Andrew (16 March 2017). History of Digital Games: Developments in Art, Design and Interaction. CRC Press. pp. 24–5, 73–6. ISBN 978-1-317-50381-1.
- Ashcraft, p. 72
- Surette, Tim, Gaming pioneer passes away Archived 2008-12-12 at the Wayback Machine , GameSpot, June 7, 2006. Accessed June 16, 2008
- "The Next Generation 1996 Lexicon A to Z: Shooter". Next Generation. No. 15. Imagine Media. March 1996. p. 40.
The first shooter is generally acknowledged to be Space Invaders.
- Buchanan, Levi, Space Invaders Archived 2008-12-08 at the Wayback Machine , IGN, March 31, 2003. Accessed June 14, 2008
- Edwards, Benj. "Ten Things Everyone Should Know About Space Invaders". 1UP.com. Archived from the original on 2009-02-26. Retrieved 2008-07-11.
- Staff (15 April 2004). "Nishikado-San Speaks". Retro Gamer. No. 3. Live Publishing. p. 35.
- "スペースインベーダー・今明かす開発秘話――開発者・西角友宏氏、タイトー・和田洋一社長対談" [Space Invader, Development Secret Story Revealed Now―Interview With Developer Tomohiro Nishikado, Taito President Yoichi Wada]. The Nikkei (in Japanese). March 21, 2008. Archived from the original on March 23, 2008. Retrieved 3 May 2021.
- "Space Invaders – 30th Anniversary Developer Interview". Shmuplations.
- Records, Guinness World (6 November 2014). Guinness World Records Gamer's Edition 2015 Ebook. Guinness World Records. p. 68. ISBN 978-1-908843-71-5.
- Geddes, Ryan; Hatfield, Daemon (2007-12-10). "IGN's Top 10 Most Influential Games". IGN. Archived from the original on 2008-07-23. Retrieved 2008-07-11.
- Kevin Bowen. "The Gamespy Hall of Fame: Space Invaders". GameSpy. Archived from the original on 2008-04-08. Retrieved 2010-01-27.
- Craig Glenday, ed. (2008-03-11). "Record Breaking Games: Shooting Games Roundup". Guinness World Records Gamer's Edition 2008. Guinness World Records. Guinness. pp. 106–107. ISBN 978-1-904994-21-3.
- "Essential 50: Space Invaders". 1UP.com. Archived from the original on 2012-10-18. Retrieved 2011-03-26.
- Grace, Lindsay (June 19, 2018). "The Original 'Space Invaders' Is a Meditation on 1970s America's Deepest Fears". Smithsonian Magazine. Retrieved April 22, 2021.
- Hague, James (1997). "Eugene Jarvis". Halcyon Days: Interviews with Classic Computer and Video Game Programmers. Dadgum Games. Archived from the original on 2002-06-22. Retrieved 18 May 2021.
- Buchanan, Levi.Galaxian Mini Archived 2011-07-13 at the Wayback Machine , IGN, April 21, 2003. Accessed June 17, 2008
- "Arcade Games". Joystick. 1 (1): 10. September 1982.
- Mielke, James, Asteroids Review Archived 2011-09-20 at the Wayback Machine ,'GameSpot, November 19, 1998. Accessed February 17, 2009
- The History of SNK Archived 2012-05-14 at the Wayback Machine , GameSpot. Accessed February 16, 2009
- Playing With Power: Great Ideas That Have Changed Gaming Forever Archived 2006-06-17 at the Wayback Machine , 1UP
- Ashcraft, p. 75
- Stearny, Mark (September 1982). "The Evolution of Space Games: How We Got From Space Invaders to Zaxxon". JoyStik (1): 8–29.
- Cuciz, David (May 2001). "Hall of Fame: Defender". GameSpy. Archived from the original on 2005-03-26. Retrieved 2009-12-06.
- Gerstmann, Jeff, Robotron: 2084 Review, GameSpot, December 20, 2005. Accessed February 17, 2009
- Staff, Top 10 Tuesday: Game Designers Archived 2012-02-14 at the Wayback Machine , IGN. Accessed February 17, 2009
- Stanton, Rich (2015). "11. The Rise of Nintendo". A Brief History Of Video Games: From Atari to Xbox One. Little, Brown Book Group, Hachette Book Group. ISBN 9781472118813.
Radar Scope owed much to the popularity of Space Invaders and Galaxian, but nevertheless felt original thank to its 3D third-person perspective.
- Roper, Chris, The Games of Atari Classics Evolved: Part 2 Archived 2007-10-29 at the Wayback Machine , IGN, October 22, 2007. Accessed June 17, 2008
- Terminator 3: The Redemption Archived 2011-07-16 at the Wayback Machine , Yahoo Games!. Accessed March 2, 2009
- Leo, Jonathan, "Rez HD", GameAxis Unwired, March 2008, p. 47
- McMillan, Luke (6 February 2013). "The Origin of The 'Shmup' Genre: A Historical Study". Game Developer. Gamasutra. Retrieved 26 September 2021.
- Ashcraft, p. 76
- Kasavin, Greg, Gradius Collection Review, GameSpot, June 7, 2006. Accessed February 12, 2009
- Fahs, Travis, Fantasy Zone Retrospective Archived 2011-07-13 at the Wayback Machine , IGN, October 1, 2008. Accessed February 13, 2009
- Kalata, Kurt, Fantasy Zone Archived 2010-01-16 at the Wayback Machine , Hardcore Gaming 101. Accessed February 02, 2010
- Morales, Emil. "Hardcore Gaming 101: Pocky and Rocky / KiKi KaiKai". Hardcore Gaming 101. Retrieved 2010-02-04.
- Todd, Brett, R-Type Dimensions Review, GameSpot, February 7, 2009. Accessed February 13, 2009
- Navarro, ALex, Raiden Review Archived 2011-09-20 at the Wayback Machine , GameSpot, November 17, 2004. Accessed February 13, 2009
- Buchanan, Levi, Raiden Archived 2009-07-24 at the Wayback Machine , IGN, February 17, 2004. Accessed February 13, 2009
- Wolf, Mark J. P.; Perron, Bernard (3 January 2014). "On the Origin of Species". The Routledge Companion to Video Game Studies. Routledge. p. 267. ISBN 978-1-136-29050-3.
- "Video Game Timeline: The Golden Age of Arcades (1980-1983)". Electronic Gaming Monthly (102): 122–8. January 1998.
- "Arcade Archives: Sasuke vs. Commander for Nintendo Switch". Nintendo.com. 13 February 2020. Retrieved 4 April 2021.
- Derboo, Sam (September 12, 2017). "Ninja Princess". Hardcore Gaming 101. Retrieved 6 June 2021.
- "「怒」を作った男" [The Man Who Made "Ikari"]. Continue (in Japanese). March 2001.
- Segre, Nicole, "Commando," Sinclair User, February 1986 (issue 47)
- "Konami's Barmy Army". Commodore User. No. 30 (March 1986). 26 February 1986. p. 13.
- Lambie, Ryan (15 March 2019). "Rolling Thunder: Namco's Hidden Arcade Gem". Den of Geek. Retrieved 11 April 2021.
- IGN's Top 100 Games Archived 2010-03-12 at the Wayback Machine , IGN, July 25, 2005. Accessed February 19, 2009
- "Top Ten Hits". Video Games. Vol. 1, no. 7. Pumpkin Press. March 1983. p. 66.
- Buchanan, Levi, Space Harrier Retrospective Archived 2011-07-13 at the Wayback Machine , IGN, September 5, 2008. Accessed February 17, 2009
- Maragos, Nich, Space Harrier (PS2) Archived 2004-11-30 at the Wayback Machine , 1UP.com, January 1, 2000. Accessed February 17, 2009
- John Szczepaniak. "Retro Japanese Computers: Gaming's Final Frontier". Hardcore Gaming 101. p. 4. Archived from the original on 2011-01-13. Retrieved 2011-03-16. Reprinted from "Retro Japanese Computers: Gaming's Final Frontier", Retro Gamer, no. 67, 2009
- "3-D WorldRunner". AllGame. Archived from the original on 2014-11-14. Retrieved 2021-05-14.. .
- "JJ: Tobidase Daisakusen Part II [Japanese]". AllGame. Archived from the original on 2014-11-15. Retrieved 2021-05-14..
- "Space Harrier 3-D". AllGame. Archived from the original on 2014-11-14. Retrieved 2021-05-14..
- Thunder Blade at the Killer List of Videogames
- *Davison, Pete (June 8, 2013). "Curtains for You: The History of Bullet Hell". US Gamer. Archived from the original on 2018-10-09. Retrieved 2018-12-11.
- Bullet hell - Glitchwave video games database
- Games That Defined the Shmups Genre Archived 2018-01-19 at the Wayback Machine
- Johnson, Mark (2016). "Bullet Hell: The Globalized Growth of Danmaku Games and the Digital Culture of High Scores and World Records". Transnational Contexts of Culture, Gender, Class, and Colonialism in Play. pp. 17–42. ISBN 978-3-319-43816-0.
- Carter, Chris (March 31, 2015). "The joy of bullet hell". Destructoid. Archived from the original on 2016-05-21. Retrieved 2018-01-19.
- Cohen, Uri (October 22, 2007). "Grind Stormer". Sega-16. Archived from the original on 2018-01-19. Retrieved 2018-01-19.
- Retro Gamer (December 28, 2017). "Ultimate Guide: Flying Shark". Archived from the original on 2018-01-19. Retrieved 2018-01-19 – via PressReader.
- Rojas, Fred (March 12, 2012). "DoDonPachi Series (Cave)". Gaming History 101. Archived from the original on 2018-01-19. Retrieved 2018-01-19.
- Pulos, Alexis; Lee, S. Austin (2016). Transnational Contexts of Culture, Gender, Class, and Colonialism in Play: Video Games in East Asia. Springer. p. 20. ISBN 9783319438177.
- Bey, Thomas; Bailey, William (February 7, 2013). "The Danmaku Game as a New Optical Art, Part I". rhizome.org. Rhizome. Archived from the original on 2018-01-26. Retrieved 2018-01-26.
- Ashcraft, pp. 78-80
- Ashcraft, pp. 77-78
- Magrino, Tom, Contra conquering DS Archived 2011-09-19 at the Wayback Machine , GameSpot, June 20, 2007. Accessed February 17, 2009
- Staff, Contra Q&A Archived 2011-09-20 at the Wayback Machine , GameSpot, October 1, 2002. Accessed February 17, 2009
- Bozon, Mark, Metal Slug Anthology Review Archived 2009-02-14 at the Wayback Machine , IGN, December 20, 2006. Accessed February 17, 2009
- Brudwig, Erik, Rez HD is Coming Archived 2011-07-13 at the Wayback Machine , IGN, January 22, 2008. Accessed February 17, 2009
- Buchanan, Levi, Fond Memories: Radiant Silvergun Archived 2011-07-13 at the Wayback Machine , IGN, April 7, 2008. Accessed February 13, 2009
- McCarthy, Dave, The Best Games That Never Came out in Britain Archived 2009-01-30 at the Wayback Machine , IGN, January 26, 2009, Accessed February 13, 2009
- Staff, Top 10 Tuesday: 2D Space Shooters Archived 2009-09-03 at the Wayback Machine , IGN, March 6, 2007. Accessed February 13, 2009
- "Most prolific fan-made shooter series". Guinness World Records. Archived from the original on 2013-04-24. Retrieved 2011-09-24.
- Ashcraft, p. 88
- Gouskos, Carrie, Geometry Wars: Retro Evolved Review Archived 2009-01-30 at the Wayback Machine , GameSpot, November 23, 2005. Accessed February 13, 2009
- "State of the Shoot ëEm Up - Edge Magazine". Next-gen.biz. 2008-11-17. Retrieved 2011-09-06.
- Ashcraft, Brian, (2008) Arcade Mania! The Turbo-Charged World of Japan's Game Centers, (Kodansha International)
- Media related to Shoot 'em ups at Wikimedia Commons