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#REDIRECT [[Browser game#.io games]] {{R from merge}} {{R to section}}
{{Short description|Browser game genre}}
'''.io games''' or '''IO games''' are a genre of free, [[Multiplayer video game|online multiplayer]] [[Browser game|browser games]] that gained popularity with the success of ''[[Agar.io]]'' in 2015.<ref name=":3">{{Cite web |date=2018-11-14 |title=A brief history of "IO" games {{!}} PacoGames.com |url=https://www.pacogames.com/blog/brief-history-of-io-games |access-date=2024-07-29 |website=PacoGames |language=en}}</ref> The games are usually characterized by simple graphics and gameplay in a free for all multiplayer arena. The term ".io" comes from the .[[.io|io domain]], which was originally assigned to the [[British Indian Ocean Territory]]<ref>{{Citation |title=IDN Code Points Policy for the .IO Top Level Domain |url=http://www.nic.io/IO-IDN-Policy.pdf |access-date=2005-12-11 |archive-url=https://web.archive.org/web/20051218074147/http://www.nic.io/IO-IDN-Policy.pdf |archive-date=2005-12-18 |url-status=dead |publisher=NIC.IO}}</ref> but became popular for game developers due to its short and memorable nature.

Thousands of .io games exist, and many of them have been subject to controversy for both political use and lack of moderation.<ref name=":0">{{Cite news |last=Castello |first=Jay |last2= |first2= |date=2018-02-22 |title=The rise and rise of .io games |url=https://www.rockpapershotgun.com/the-rise-and-rise-of-io-games |access-date=2024-07-29 |work=Rock, Paper, Shotgun |language=en}}</ref>

== History ==

=== .io domain ===
[[File:DotIO-logo.png|thumb|.io domain logo]]
The .io domain was delegated by the [[Internet Assigned Numbers Authority]] to British entrepreneur [[Paul Kane (entrepreneur)|Paul Kane]] in 1997 together with the [[Country code top-level domain|ccTLDs]] [[.ac]] ([[Ascension Island]]), [[.sh]] ([[Saint Helena|St Helena]]), and [[.tm]] ([[Turkmenistan]]).<ref>{{cite web |last1=Bridle |first1=James |title=.IO: British Indian Ocean Territory |url=http://citizen-ex.com/stories/io |url-status=dead |archive-url=https://web.archive.org/web/20210702173249/http://citizen-ex.com/stories/io |archive-date=2 July 2021 |access-date=2 August 2021 |publisher=Citizen Ex}}</ref> The first subdomain was registered under .io in 1998, when [[Levi Strauss & Co.]] registered the domain levi.io.<ref>https://www.whois-search.com/whois/levi.io</ref>

Labels for .io domains may only contain [[Alphanumericals|alphanumeric]] characters and [[Hyphen|hyphens]], and must be between 3 and 63 characters long. Domain names cannot begin or end with a hyphen symbol, and may not contain two consecutive hyphens. The entire domain name may not contain more than 253 characters.<ref name="rfc1034">{{IETF RFC|1035}}, ''Domain names--Implementation and specification'', P. Mockapetris (Nov 1987)</ref>


=== First .io games ===

==== ''Agar.io''<nowiki/>'s rise to popularity ====
''Agar.io'' is considered the first ever .io game. The game was announced on [[4chan]] on 27 April, 2015 by Matheus Valadares,<ref>{{Cite web |title=The story of Agar.io {{!}} Gamehag |url=https://gamehag.com/news/the-story-of-agario |access-date=2024-07-29 |website=gamehag.com |language=en}}</ref> a then 19-year-old Brazilian developer. The game, which has [[Game mechanics|mechanics]] similar to Osmos, another less popular game.layers control one or more circular cells in a map representing a Petri dish. The goal is to gain as much mass as possible by eating cells and player cells smaller than the player's cell while avoiding larger ones which can eat the player's cells.

Unlinke Osmos, ''Agar.io'' went viral, and was featured on the free online games site [[Miniclip]].<ref name=":0" /> The mobile version of ''Agar.io'' for [[iOS]] was released on 8 July 2015 and [[Android (operating system)|Android]] on 7 July 2015 by [[Miniclip]]. The browser version was released in June 2015 by [[CrazyGames]].<ref>{{Cite web |title=Agar.io 🕹️ Play on CrazyGames |url=https://www.crazygames.com/game/agario |access-date=2023-09-27 |website=www.crazygames.com |language=en}}</ref> The [[YouTuber|Youtuber]] [[PewDiePie]] created a video titled "REDDIT WANTS TO EAT ME! (Agario Part 1) | PewDiePie," which was over 8.5 million views as of July 2024.<ref>{{Cite AV media |url=https://www.youtube.com/watch?v=5wrfguOKlac |title=REDDIT WANTS TO EAT ME! (Agario Part 1) {{!}} PewDiePie |date=2015-05-30 |last=PewDiePie |access-date=2024-07-29 |via=YouTube}}</ref> The creation and quickly growing popularity of ''Agar.io''<ref name=":02">{{Cite journal |last=Lindsey |first=Cameron |date=March 2019 |title=Agar.io: The Game's in the Name |url=https://journals.sagepub.com/doi/abs/10.1177/1555412018821483?journalCode=gaca |url-status=live |journal=[[Games and Culture]] |volume=14 |issue=2 |pages=154–169 |doi=10.1177/1555412018821483 |s2cid=150281404 |url-access=subscription |archive-url=https://web.archive.org/web/20230505130241/https://journals.sagepub.com/doi/abs/10.1177/1555412018821483?journalCode=gaca |archive-date=5 May 2023 |access-date=5 May 2023}}</ref><ref name=":1">{{Cite magazine |last=Burgess |first=Matt |date=April 12, 2016 |title=How addictive simplicity made Agar.io a global hit |url=https://www.wired.co.uk/article/agario-miniclip-game-viral-success-pewdiepie-youtube |url-access=limited |access-date=May 5, 2023 |magazine=[[Wired UK]]}}</ref> led to the creation of similar games using the .io domain, and eventually the .io game genre.<ref name=":3" />

==== ''Slither.io''<nowiki/>'s rise to popularity ====
''[[Slither.io]]'' was the second .io game to be released, which is a free for all multiplayer game that is in the [[Snake (video game genre)|Snake]] genre. The basic premise of the game has 50 players compete to eat colored orbs and grow as large as possible, while destroying other player's snakes.<ref>{{Cite web |last=Switzer |first=Eric |date=2019-07-09 |title=Where Slither.io Came From And Why It's So Popular |url=https://www.thegamer.com/slitherio-history-success-guide-strategy/ |access-date=2024-07-29 |website=TheGamer |language=en}}</ref> The game was created in 2016 by Steven Howse, a self-taught independent developer who was inspired to make it after playing ''Agar.io.'' The game quickly rose to be the top game on many platforms.<ref>{{cite web |title=Slither.io Traffic, Demographics and Competitors |url=http://www.alexa.com/siteinfo/slither.io |url-status=dead |archive-url=https://web.archive.org/web/20170521135224/http://www.alexa.com/siteinfo/slither.io |archive-date=May 21, 2017 |access-date=March 14, 2017 |website=[[Alexa Internet]]}}</ref>

=== .io games as a genre ===
Starting in around 2016, soon after the popularity spikes of ''Agar.io'' and ''Slither.io'', more games in the .io games genre began to be released. Many of these games were simple [[Video game clone|clones]] of popular games, usually released in a top down-format.<ref name=":3" /> Some notable games released in this period include ''[[Diep.io]]'', another game by Matheus Valadares,<ref>{{Cite web |last=Hodapp |first=Eli |date=21 July 2016 |title='Diep.io' Hits the App Store From the Creator of 'Agar.io' |url=https://toucharcade.com/2016/07/21/diep-io-hits-the-app-store-by-the-creator-of-agar-io/ |access-date=2023-05-05 |website=[[TouchArcade]] |language=en-US}}</ref> ''[[ZombsRoyale.io]],<ref name=":2">{{Cite web |last=Madnani |first=Mikhail |date=May 11, 2018 |title='ZombsRoyale.io' Is a 2D Top Down Battle Royale That Blends 'PUBG' and 'Fortnite, Available Now on iOS |url=https://toucharcade.com/2018/05/11/zombsroyaleio-fortnite-pubg-free-iphone-battle-royale/ |access-date=April 23, 2019 |website=[[TouchArcade]] |language=en-US}}</ref> Krunker.io, Wings.io, [[Surviv.io]],'' and ''[[Hole.io]]''. These games all remain popular and are some of the most played games in the .io games genre.

=== Covid-19 ===
During Covid-19, .io games became very popular because of their accessibility on the web. Most games, not just .io games, however, also experienced growth during this time.<ref>{{Cite web |title=The Gang {{!}} The Gaming Industry After Covid-19 |url=https://www.thegang.io/news/the-gaming-industry-after-covid-19 |access-date=2024-07-29 |website=www.thegang.io}}</ref>

== Criticisms ==

== References ==

{[Video game genre}}

[[Category:.io video games| ]]
[[Category:Video game genres|io]]

Latest revision as of 22:47, 26 September 2024

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