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| name = Source 2
| logo = Source 2 engine logo.svg
| logo alt = Official logo of
| developer = [[Valve Corporation|Valve]]
| released = {{start date and age|2015}}
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| license = [[Proprietary software|Proprietary]]
}}
'''Source 2''' is a [[video game engine]] developed by [[Valve Corporation|Valve]]. The engine was announced in 2015 as the successor to the original [[Source (game engine)|Source]] engine, with the first game to use it, ''[[Dota 2]]'', being ported from Source that same year. Other Valve games
== History ==
Plans for a successor to the original [[Source engine]] began following the release of ''[[Half-Life 2: Episode Two]]'' in 2007.<ref name="ign ep3 2020">{{cite web | url = https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made | title = Valve Explains Why Half-Life 2: Episode 3 Was Never Made | first = Tom | last = Marks | date = March 23, 2020 | access-date = March 23, 2020 | work = [[IGN]] | archive-date = March 23, 2020 | archive-url = https://web.archive.org/web/20200323171744/https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made | url-status = live }}</ref><ref name=":1">{{Cite book |last=Keighley |first=Geoff |title=Half-Life: Alyx - Final Hours |year=2020}}</ref> The first engine tech demo was created in 2010 by remaking a map from ''[[Left 4 Dead 2]]''.<ref name=":1" /> Images of this were leaked onto the internet in early 2014.<ref>{{Cite web |last=Phillips |first=Tom |date=January 28, 2014 |title=Source 2 images show next-gen Left 4 Dead 2 prototype - report |url=https://www.eurogamer.net/articles/2014-01-28-source-2-images-show-next-gen-left-4-dead-2-prototype-report |url-status=live |archive-url=https://web.archive.org/web/20140131044301/https://www.eurogamer.net/articles/2014-01-28-source-2-images-show-next-gen-left-4-dead-2-prototype-report |archive-date=January 31, 2014 |access-date=December 2, 2020 |website=[[Eurogamer]] |language=en}}</ref> At the 2014 [[Game Developers Conference]], Valve employee Sergiy Migdalskiy showed off a Source 2 physics debugging tool being used in ''Left 4 Dead 2''.<ref name="source2.62">{{cite web |last=Migdalskiy |first=Sergiy |date=April 14, 2014 |title=Physics for Game Programmers Debugging |url=http://www.gdcvault.com/play/1020065/Physics-for-Game-Programmers-Debugging |url-status=live |archive-url=https://web.archive.org/web/20170422132935/http://www.gdcvault.com/play/1020065/Physics-for-Game-Programmers-Debugging |archive-date=April 22, 2017 |access-date=April 21, 2017 |website=[[Game Developers Conference]]}}</ref> Source 2 was first made available via [[Steam Workshop]] tools for ''[[Dota 2]]'' in 2014 prior to it being officially announced at the 2015 Game Developers Conference.<ref name="SteamFree">{{cite web|url=http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers|title=Valve announces Source 2 engine, free for developers|last=Kollar|first=Philip|website=[[Polygon (website)|Polygon]] |date=March 3, 2015|access-date=March 3, 2015|url-status=live|archive-url=https://web.archive.org/web/20150305093315/http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers|archive-date=March 5, 2015}}</ref> There, Valve stated their intent for it was to allow for content to be created more efficiently.<ref name="ign ep3 2020" /><ref name="source2.82">{{cite web |last=Walker |first=John |date=November 11, 2012 |title=Gabe Newell Might Have Announced Source 2, Possibly |url=https://www.rockpapershotgun.com/2012/11/11/gabe-newell-might-have-announced-source-2-possibly/ |url-status=live |archive-url=https://web.archive.org/web/20201111205740/https://www.rockpapershotgun.com/2012/11/11/gabe-newell-might-have-announced-source-2-possibly/ |archive-date=November 11, 2020 |access-date=April 23, 2017 |website=[[Rock Paper Shotgun]]}}</ref><ref name="source2.02">{{cite web |last=Mahardy |first=Mike |date=March 3, 2015 |title=GDC 2015: Valve Announces Source 2 Engine |url=http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |url-status=live |archive-url=https://web.archive.org/web/20150304021002/http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |archive-date=March 4, 2015 |access-date=April 21, 2017 |website=[[IGN]]}}</ref><ref>{{Cite web |last=McKeand |first=Kirk |date=March 2, 2017 |title=Gabe Newell on Source 2: 'For us, it's useful. For other devs, it's not as useful as Unity' |url=https://www.pcgamesn.com/source-2-release-date |url-status=live |archive-url=https://web.archive.org/web/20200723220222/https://www.pcgamesn.com/source-2-release-date |archive-date=July 23, 2020 |access-date=April 5, 2020 |website=[[PCGamesN]] |language=en-GB}}</ref> Valve also stated that it would support the [[Vulkan (API)|Vulkan graphics API]] and use a new in-house [[physics engine]] called Rubikon, which would replace the need for the third-party [[Havok (software)|Havok]] tools.<ref name="source2.62" /><ref>{{cite news |last1=Mahardy |first1=Mike |date=March 3, 2015 |title=GDC 2015: Valve Announces Source 2 Engine |work=[[IGN]] |publisher= |url=http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |url-status=live |access-date=March 3, 2015 |archive-url=https://web.archive.org/web/20150304021002/http://www.ign.com/articles/2015/03/04/gdc-2015-valve-announces-source-2-engine |archive-date=March 4, 2015}}</ref><ref name=":0">{{Cite web|url = http://media.steampowered.com/apps/valve/2015/Migdalskiy_Sergiy_Physics_Optimization_Strategies.pdf|title = Physics for Game Developers: Physics Optimization Strategies|date = March 2015|access-date = October 2, 2015|publisher = [[Game Developers Conference]]|last = Migdalskiy|first = Sergiy|url-status=live|archive-url = https://web.archive.org/web/20160304061355/http://media.steampowered.com/apps/valve/2015/Migdalskiy_Sergiy_Physics_Optimization_Strategies.pdf|archive-date = March 4, 2016|df = mdy-all}}</ref>
[[Gabe Newell]], president and founder of Valve, said that the company were prioritizing the development of their own games before they would release the engine and its [[software development kit]] to the public.
In June 2015, Valve announced that the entirety of ''[[Dota 2]]'' would be ported over to Source 2 in an update called ''[[Dota 2 Reborn]]''.<ref name="source2.12">{{cite web |last=Anthony |first=Sebastian |date=August 8, 2014 |title=Valve quietly releases Source 2 engine, Source 2 version of Dota 2, and new Hammer map editor |url=https://www.extremetech.com/extreme/187723-valve-quietly-releases-source-2-engine-source-2-version-of-dota-2-and-new-hammer-map-editor |url-status=live |archive-url=https://web.archive.org/web/20140809183322/https://www.extremetech.com/extreme/187723-valve-quietly-releases-source-2-engine-source-2-version-of-dota-2-and-new-hammer-map-editor |archive-date=August 9, 2014 |access-date=August 8, 2014 |website=[[ExtremeTech]]}}</ref><ref name="source2.22">{{cite web |last=Plaugic |first=Lizzie |date=June 13, 2015 |title=Dota 2 is getting overhauled with a new game engine |url=https://www.theverge.com/2015/6/13/8776369/dota-2-reborn-new-engine-source-2 |url-status=live |archive-url=https://web.archive.org/web/20170422133203/http://www.theverge.com/2015/6/13/8776369/dota-2-reborn-new-engine-source-2 |archive-date=April 22, 2017 |access-date=April 21, 2017 |website=[[The Verge]]}}</ref><ref>{{cite web |last1=Martin |first1=Michael |date=June 13, 2015 |title=Valve Announces Dota 2 Reborn |url=http://www.ign.com/articles/2015/06/13/valve-announces-dota-2-reborn-open-beta-coming-next-week |url-status=live |archive-url=https://web.archive.org/web/20160629144536/http://www.ign.com/articles/2015/06/13/valve-announces-dota-2-reborn-open-beta-coming-next-week |archive-date=June 29, 2016 |access-date=July 10, 2016 |website=[[IGN]]}}</ref><ref>{{cite web |last1=Macy |first1=Seth |date=September 9, 2015 |title=Dota 2 Now Valve's First Ever Source 2 Game |url=http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |url-status=live |archive-url=https://web.archive.org/web/20150910075128/http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |archive-date=September 10, 2015 |access-date=September 9, 2015 |website=[[IGN]] |publisher=}}</ref> ''Reborn'' was first released to the public as an opt-in beta update that same month before officially replacing the original client in September 2015, making it the first game to use the engine.<ref name="source2.32">{{cite web |last=Nunneley |first=Stephany |date=June 13, 2015 |title=Dota 2 being revamped with Source 2 engine and upgraded DotaTV experience |url=https://www.vg247.com/2015/06/13/dota-2-source-2-engine-dotatv/ |url-status=live |archive-url=https://web.archive.org/web/20170422142931/https://www.vg247.com/2015/06/13/dota-2-source-2-engine-dotatv/ |archive-date=April 22, 2017 |access-date=April 21, 2017 |website=[[VG247]]}}</ref><ref name="source2.42">{{cite web |last=Boudreau |first=Ian |date=June 13, 2015 |title=Dota 2 Will Update To Source 2 Engine Soon, Valve Says |url=http://gameranx.com/updates/id/30218/article/dota-2-will-update-to-source-2-engine-soon-valve-says/ |url-status=dead |archive-url=https://web.archive.org/web/20151001112250/http://gameranx.com/updates/id/30218/article/dota-2-will-update-to-source-2-engine-soon-valve-says/ |archive-date=October 1, 2015 |access-date=April 21, 2017 |website=GameRanx}}</ref><ref>{{cite web |last=Livingston |first=Christopher |url=http://www.pcgamer.com/valve-announces-dota-2-reborn-new-engine-coming/ |title=Valve announces Dota 2 Reborn, new engine coming |date=June 12, 2015 |work=[[PC Gamer]] |access-date=June 13, 2015 |url-status=live |archive-url=https://web.archive.org/web/20150615040444/http://www.pcgamer.com/valve-announces-dota-2-reborn-new-engine-coming/ |archive-date=June 15, 2015 }}</ref><ref>{{cite web |last1=Macy |first1=Seth |date=September 9, 2015 |title=Dota 2 Now Valve's First Ever Source 2 Game |url=http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |url-status=live |archive-url=https://web.archive.org/web/20150910075128/http://www.ign.com/articles/2015/09/09/dota-2-now-valves-first-ever-source-2-game |archive-date=September 10, 2015 |access-date=September 9, 2015 |website=[[IGN]] |publisher=}}</ref> Source 2 has also been used for Valve's ''[[Artifact (video game)|Artifact]]'' and ''[[Dota Underlords]]'', with the engine later being supported on [[Android (operating system)|Android]] and [[iOS]] for the latter.<ref>{{cite web | url = https://www.pcgamesn.com/artifact/artifact-source-2-ios-android | title = Artifact will use Source 2, bringing the engine to iOS and Android | first = Dustin | last = Bailey | date = March 8, 2018 | access-date = March 8, 2018 | work = [[PCGamesN]] | url-status=live | archive-url = https://web.archive.org/web/20180309192121/https://www.pcgamesn.com/artifact/artifact-source-2-ios-android | archive-date = March 9, 2018 | df = mdy-all }}</ref><ref>{{cite web |last1=McWhertor |first1=Michael |date=June 13, 2019 |title=Valve's Auto Chess competitor is Dota Underlords |url=https://www.polygon.com/2019/6/13/18678182/dota-underlords-valve-auto-chess-open-beta-platforms |url-status=live |archive-url=https://web.archive.org/web/20190613222336/https://www.polygon.com/2019/6/13/18678182/dota-underlords-valve-auto-chess-open-beta-platforms |archive-date=June 13, 2019 |access-date=June 13, 2019 |website=[[Polygon (website)|Polygon]]}}</ref> The engine also supports the creation of games in [[virtual reality]], being used in [[SteamVR]] Home, the ''[[Robot Repair]]'' tech demo within ''[[The Lab (video game)|The Lab]]'', and ''[[Half-Life: Alyx]]''.<ref>{{cite web |last1=Heaney |first1=David |date=March 25, 2020 |title=Half-Life: Alyx Highlights Valve's Powerhouse Physics Engine |url=https://uploadvr.com/half-life-alyx-rubikon-physics/ |url-status=live |archive-url=https://web.archive.org/web/20200723235814/https://uploadvr.com/half-life-alyx-rubikon-physics/ |archive-date=July 23, 2020 |access-date=April 5, 2020 |website=[[UploadVR]]}}</ref><ref>{{cite web |last1=Hollister |first1=Sean |date=November 21, 2019 |title=Half-Life: Alyx is officially coming March 2020, and here's your first look |url=https://www.theverge.com/2019/11/21/20975423/half-life-alyx-vr-price-release-date-screenshots-trailer-valve-steam |url-status=live |archive-url=https://web.archive.org/web/20191121185303/https://www.theverge.com/2019/11/21/20975423/half-life-alyx-vr-price-release-date-screenshots-trailer-valve-steam |archive-date=November 21, 2019 |access-date=November 21, 2019 |website=[[The Verge]]}}</ref> Source 2 tools made specifically for creating content for ''Half-Life: Alyx'' were released in May 2020.<ref>{{cite web |last=Fenlon |first=Wes |date=May 15, 2020 |title=Half-Life: Alyx now has Steam Workshop support and official mod tools |url=https://www.pcgamer.com/half-life-alyx-now-has-steam-workshop-support-and-official-mod-tools/ |url-status=live |archive-url=https://web.archive.org/web/20200517142057/https://www.pcgamer.com/half-life-alyx-now-has-steam-workshop-support-and-official-mod-tools/ |archive-date=May 17, 2020 |access-date=May 16, 2020 |website=[[PC Gamer]]}}</ref>
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! 2015
| ''[[Dota 2]]''
| rowspan="
| Ported from [[Source (game engine)|Source]]; originally released in 2013
|-
! 2016
| ''[[Robot Repair]]''
|
|-
! 2018
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| Port of ''[[Counter-Strike: Global Offensive]]'' (2012)<ref>{{cite web |last1=Roth |first1=Emma |last2=Clark |first2=Mitchell |last3=Hollister |first3=Sean |date=March 22, 2023 |title=Valve announces Counter-Strike 2, a free replacement for CS:GO |url=https://www.theverge.com/2023/3/22/23651939/counterstrike-cs2-valve-smoke-grenades-limited-test |access-date=22 March 2023 |website=[[The Verge]]}}</ref>
|-
! rowspan="2" {{TBA}}
| ''[[Deadlock (video game)|Deadlock]]''
|[[Beta test]]ing underway as of 2024
|-
| Stylized as HL3; development shifted from [[Unreal Engine]] to Source 2 in 2015<ref>{{cite web |last=Newman |first=Garry |date=October 27, 2020 |title=New Engine |url=https://sbox.facepunch.com/news/new-engine |url-status=live |archive-url=https://web.archive.org/web/20210119091458/https://sbox.facepunch.com/news/new-engine |archive-date=January 19, 2021 |access-date=January 25, 2022 |website=[[Facepunch]]}}</ref>▼
| ''[[S&box]]''<!--Do not change to Sandbox per MOS:TMSTYLE-->
| [[Facepunch Studios]]
▲| {{ubl|Stylized as
|}
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