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Source 2
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<h2 id="history">History</h2> <p>Plans for a successor to the original <a href="/facts/Source_engine/5sHPl3hr">Source engine</a> began following the release of <i><a href="/facts/Half-Life_2:_Episode_Two/QPk10Pjq">Half-Life 2: Episode Two</a></i> in 2007.<a class="footnote-ref" id="fnref:1" href="#fn:1"><sup>1</sup></a><a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a> The first engine tech demo was created in 2010 by remaking a map from <i><a href="/facts/Left_4_Dead_2/KDdLCwll">Left 4 Dead 2</a></i>.<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a> Images of this were leaked onto the internet in early 2014.<a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a> At the 2014 <a href="/facts/Game_Developers_Conference/G8WBDbyW">Game Developers Conference</a>, Valve employee Sergiy Migdalskiy showed off a Source 2 physics debugging tool being used in <i>Left 4 Dead 2</i>.<a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a> Source 2 was first made available via <a href="/facts/Steam_Workshop/nrpWwLA9">Steam Workshop</a> tools for <i><a href="/facts/Dota_2/BD8DugTD">Dota 2</a></i> in 2014 prior to it being officially announced at the 2015 Game Developers Conference.<a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a> There, Valve stated their intent for it was to allow for content to be created more efficiently.<a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a><a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a> Valve also stated that it would support the <a href="/facts/Vulkan_(API)/e188Vdpc">Vulkan graphics API</a> and use a new in-house <a href="/facts/Physics_engine/lAsEdSA4">physics engine</a> called Rubikon, which would replace the need for the third-party <a href="/facts/Havok_(software)/RopFFkHl">Havok</a> tools.<a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a><a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a><a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a> </p><p><a href="/facts/Gabe_Newell/Y3IudnNp">Gabe Newell</a>, 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 <a href="/facts/Software_development_kit/2Hkk6Hbs">software development kit</a> to the public. This was to ensure the highest quality for developers; he added that they were intending to make the engine free to use for game developers as long as the game is published on their <a href="/facts/Steam_(service)/nrpWwLA9">Steam</a> service.<a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a><a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a><a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a> </p><p>In June 2015, Valve announced that the entirety of <i><a href="/facts/Dota_2/BD8DugTD">Dota 2</a></i> would be ported over to Source 2 in an update called <i><a href="/facts/Dota_2_Reborn/BD8DugTD">Dota 2 Reborn</a></i>.<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a><a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a><a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a><a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a> <i>Reborn</i> 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.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a><a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a><a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> Source 2 has also been used for Valve's <i><a href="/facts/Artifact_(video_game)/gJ9hK7qv">Artifact</a></i> and <i><a href="/facts/Dota_Underlords/RhSpeNp4">Dota Underlords</a></i>, with the engine later being supported on <a href="/facts/Android_(operating_system)/nNyHb0xz">Android</a> and <a href="/facts/IOS/mK5cggH5">iOS</a> for the latter.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a><a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a> The engine also supports the creation of games in <a href="/facts/Virtual_reality/0psDGsxT">virtual reality</a>, being used in <a href="/facts/SteamVR/nrpWwLA9">SteamVR</a> Home, the <i><a href="/facts/Robot_Repair/j4bDxJcF">Robot Repair</a></i> tech demo within <i><a href="/facts/The_Lab_(video_game)/j4bDxJcF">The Lab</a></i>, and <i><a href="/facts/Half-Life:_Alyx/jhS7P80R">Half-Life: Alyx</a></i>.<a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a><a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> Source 2 tools made specifically for creating content for <i>Half-Life: Alyx</i> were released in May 2020.<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> </p> <h2 id="games">Games</h2> <table><tbody><tr><th>Year</th><th>Game</th><th>Developer</th><th>Note(s)</th></tr><tr><th>2015</th><td><i><a href="/facts/Dota_2/BD8DugTD">Dota 2</a></i></td><td rowspan="8">Valve</td><td>Ported from <a href="/facts/Source_(game_engine)/5sHPl3hr">Source</a>; originally released in 2013</td></tr><tr><th>2016</th><td><i><a href="/facts/Robot_Repair/j4bDxJcF">Robot Repair</a></i></td><td>Tech demo included within <i><a href="/facts/The_Lab_(video_game)/j4bDxJcF">The Lab</a></i><a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a></td></tr><tr><th>2018</th><td><i><a href="/facts/Artifact_(video_game)/gJ9hK7qv">Artifact</a></i></td><td></td></tr><tr><th rowspan="2">2020</th><td><i><a href="/facts/Dota_Underlords/RhSpeNp4">Dota Underlords</a></i></td><td>Released in <a href="/facts/Early_access/03kf1CDn">early access</a> in 2019</td></tr><tr><td><i><a href="/facts/Half-Life:_Alyx/jhS7P80R">Half-Life: Alyx</a></i></td><td>Made for <a href="/facts/Virtual_reality_headset/wzMo56XW">virtual reality headsets</a></td></tr><tr><th>2022</th><td><i><a href="/facts/Aperture_Desk_Job/2NsTfSYG">Aperture Desk Job</a></i></td><td>Tech demo created for the <a href="/facts/Steam_Deck/E6VmDMWV">Steam Deck</a><a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a></td></tr><tr><th>2023</th><td><i><a href="/facts/Counter-Strike_2/XKFC5TkX">Counter-Strike 2</a></i></td><td>Port of <i><a href="/facts/Counter-Strike:_Global_Offensive/dLb5NQrJ">Counter-Strike: Global Offensive</a></i> (2012)<a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a></td></tr><tr><th rowspan="2">TBA</th><td><i><a href="/facts/Deadlock_(video_game)/gjcw0ugj">Deadlock</a></i></td><td><a href="/facts/Beta_test/z4Q4RElA">Beta testing</a> underway as of 2024</td></tr><tr><td><i><a href="/facts/S%26box_(game_engine)/T7zEQ891">S&box</a></i></td><td><a href="/facts/Facepunch_Studios/PrQEq6kg">Facepunch Studios</a></td><td><ul><li>Stylized as <i>s&box</i>; development shifted from <a href="/facts/Unreal_Engine/0ghxRQl8">Unreal Engine</a> in 2020<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a></li><li>Expected to be a game engine and platform for developers to make Source 2 games<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a></li></ul></td></tr></tbody></table> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Marks, Tom (March 23, 2020). "Valve Explains Why Half-Life 2: Episode 3 Was Never Made". IGN. Archived from the original on March 23, 2020. Retrieved March 23, 2020. <a href="https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made" target="_blank">https://www.ign.com/articles/valve-explains-why-half-life-2-episode-3-was-never-made</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>Keighley, Geoff (2020). Half-Life: Alyx - Final Hours. <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Keighley, Geoff (2020). Half-Life: Alyx - Final Hours. <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>Phillips, Tom (January 28, 2014). "Source 2 images show next-gen Left 4 Dead 2 prototype - report". Eurogamer. Archived from the original on January 31, 2014. 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Retrieved March 3, 2015. <a href="http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers" target="_blank">http://www.polygon.com/2015/3/3/8145273/valve-source-2-announcement-free-developers</a> <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p>Zacny, Rob (February 16, 2016). "Khronos and Valve reveal details of Vulkan API, show Dota 2 running in Source 2 on Intel integrated graphics". PCGamesN. Archived from the original on March 7, 2015. Retrieved November 12, 2017. <a href="https://www.pcgamesn.com/khronos-and-valve-reveal-details-of-vulkan-api-show-dota-2-running-in-source-2-on-intel-integrated-graphics" target="_blank">https://www.pcgamesn.com/khronos-and-valve-reveal-details-of-vulkan-api-show-dota-2-running-in-source-2-on-intel-integrated-graphics</a> <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Savage, Phil (March 5, 2015). "Source 2 will be free; won't ask for royalties". PC Gamer. 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