Source 2

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id Tech 2 Quake engineGoldSrc GoldSrcSource SourceSource 2 Source 2

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Blank image.pngTodo: This page is not a stub but could use some more detail.
Screenshot of Half-Life: Alyx Half-Life: Alyx, using the Source 2 Engine.
Screenshot of de_canals de_canals in Counter-Strike 2 Counter-Strike 2.

Source 2 Source 2 is a 3D video game engine currently in development by Valve as a successor to Source Source. It is used in Dota 2 Dota 2, SteamVR Home SteamVR Home, Half-Life: Alyx Half-Life: Alyx, S&box S&box, Counter-Strike 2 Counter-Strike 2, and more.

Source 2 was first made public with the Dota 2 Workshop Tools Alpha in August 6th 2014 and formally announced by Valve in March of 2015 at the Game Developers Conference. It was then implemented into Dota 2 on June 17th 2015. Valve has announced that Source 2 will be released to the public for free, and it will only take money should it be used for commercial products.

The engine is capable of rendering highly complex and well detailed scenes with minimal framerate drops, thanks to its new 64-bit support alongside Vulkan, allowing for better multi-core rendering and more efficient 3D rendering.


  • Integrated asset management via the Asset System.
  • New engine-integrated authoring tools, rebuilt from the ground up.
  • Completely rebuilt Hammer level editor, featuring modern polygon mesh editing tools.
  • Support for both forward and deferred rendering pipelines.
  • Lower latency and more responsive input.
  • Improved audio and voice processing.
  • New in-house physics engine, Rubikon. Includes support for Cloth Simulation.
  • Physically based rendering support.
  • Support for the Steam Audio sound system.
  • WebM video, replacing the previous Bink Video format.
  • Enhanced Panorama GUI, designed to be more user friendly.
  • Native DirectX 11® and Vulkan® support, with support for Shader Model 5.0 and later.
  • 64-bit supported
    • Previously, Source 2 also support 32-bit, which has been dropped since Dota 2 Dota 2 (except SteamVR Home SteamVR Home).


Warning.pngWarning:Support for 32-bit, OpenGL, DirectX 9, XAudio, and macOS versions below 10.14 were removed in 2021 with the Dota 2 Dota 2 update. SteamVR Home SteamVR Home is not affected. Newer games such as Half-Life: Alyx Half-Life: Alyx and Counter-Strike 2 Counter-Strike 2 doesn't support them.
Warning.pngWarning:Some games like Counter-Strike 2 Counter-Strike 2 no longer support Squirrel (initially as of the Limited Test Release), making things non-trivial to port and with no chance of a proper transition period when both implementations are functional.

Products using Source 2


Products made by Valve.


Year Title Developer(s) Publisher(s) Platforms Notes
2015 Dota 2 Dota 2 Valve Valve PC Originally using Source Source, ported to Source 2 Source 2 in 2015.
2016 SteamVR Performance Test Valve Valve PC (VR) Non-interactive version of the Robot Repair demo
2016 Robot Repair – Included in The Lab The Lab Valve Valve PC (VR)
2016 Destinations Destinations Valve Valve PC (VR) Replaced by SteamVR Home.
2017 SteamVR Home SteamVR Home Valve Valve PC (VR)
2018 Artifact Artifact Valve Valve PC The Dota Card Game.
2019 Dota Underlords Dota Underlords Valve Valve PC
2020 Half-Life: Alyx Half-Life: Alyx Valve Valve PC (VR)
2022 Aperture Desk Job Aperture Desk Job Valve Valve PC (Steam Deck)


This section are for unreleased Valve games that are not publicly released or is in Beta/Early Access.

Year Title Developer(s) Publisher(s) Platforms Notes
TBA Counter-Strike 2 Counter-Strike 2 Valve Valve PC Supposed to be released in Summer 2023, but it was most likely delayed, as of September.


Products made by third-party companies and mod teams.


  • None yet.


This section are for unreleased 3rd party games that are not publicly released or is in Beta/Early Access.

Year Title Developer(s) Publisher(s) Platforms Notes
TBA S&box S&box Facepunch Studios Facepunch Studios PC


See Also

id Tech 2 Quake engineGoldSrc GoldSrcSource SourceSource 2 Source 2