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Valve also stated that it would support the Vulkan graphics API and use a new in-house physics engine called Rubikon, which would replace the need for the third-party Havok tools. There, Valve stated their intent for it was to allow for content to be created more efficiently. 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. 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.

Images of this were leaked onto the internet in early 2014. The first engine tech demo was created in 2010 by remaking a map from Left 4 Dead 2. Plans for a successor to the original Source engine began following the release of Half-Life 2: Episode Two in 2007. Since then, Valve's Artifact, Dota Underlords, Half-Life: Alyx, Aperture Desk Job and Counter-Strike 2 have all been made with the engine. The engine was announced in 2015 as the successor to the original Source engine, with the first game to use it, Dota 2, being ported from Source that same year. Source 2 is a video game engine developed by Valve.
