User:Another OWL/Sandbox/Future version of the article/en

Screenshot in-game of Counter-Strike: Source, using the Source Engine.

Screenshot in-game of Counter-Strike: Global Offensive, using Valve's latest branch of the Source Engine.

Promotional screenshot of Apex Legends, which runs on a heavily modified version of the Source Engine, featuring DirectX (Direct3D) 11 and better graphics, plus increased the engine limit, allowing maps to be larger.

Source is a 3D game engine created by Valve in 2004, and is the successor to GoldSrc. Source has been used by Valve, third-party companies, and (much like GoldSrc) countless community mods by people around the globe. Today, it has largely been replaced by the Source 2 engine for first-party usage since 2015, but it's still being commonly used today by modders and some third-party companies, and it's still regularly being maintained with engine and security updates.

Clarify: not all Source games have Valve Anti-Cheat. See Apex Legends.

Clarify: The features list below may not applies to third-party or newer Source engine branches. For the list of branches, see this category page.

Renderer

• Version 3.0 (and below) shaders

Note:Unofficially, some third-party games can also support Shader Model 5.0 and later by using Direct3D 11 and later, like Titanfall.

• Anti-aliasing support
  • Source is the first Valve engine to support anti-aliasing, prior to MSAA (4X) being added to GoldSrc in 2013.
  • MSAA is the traditional anti-aliasing method, works by samples (renders) each pixel multiple times at different locations within the frame and averages the samples to produce the final pixel value. It is commonly used in most older video games, including almost all Source engine games (except Black Mesa (since the Xen update), Apex Legends, etc...). Up to 8x MSAA (or 6x MSAA in Source 2004) is supported. Older GPUs (such as pre-Maxwell Nvidia cards) also support CSAA.
  • FXAA is also supported in CS:GO engine branch. Unlike MSAA, FXAA has less performance hit than most other AA methods due to it being a post-processing effect, which meant that it can be unofficially added to older Source engine games (or even other video games, other engines and other applications in general), using software such as ReShade, or even built-in via the graphics driver settings, and unlike MSAA, FXAA and other post-processing method will affect transparent textures, however, due to it's nature, this makes FXAA looks worse than many other AA methods as it's appear to blur the image, plus it does not reconstruct the pixel which was missing due to lack of an traditional anti-aliasing.
  • TAA is a modern AA method commonly used in most modern games, superseded the MSAA method for anti-aliasing, it works by combining information from past frames and the current frame to remove jaggies in the current frame. However, as mentioned, TAA combines information from past and current frames can cause blurring and ghosting effect while in motion, more noticeable with low FPS. In Source engine case, it is only available in few games such as Apex Legends.
    
    Tip:If the game is running in 4K resolution or above, or by downscaling 4K to 1080p or lower, the need for anti-aliasing is greatly reduced.
• Bump mapping and Normal mapping on models and the world
• Author shaders with HLSL
• Cube and environment mapping
  • Cubemapping also supports Anisotropy (in all games since )
• Phong shading for models
  • Phong is also supported on world brushes (in all games since )
• Dynamic lights, vertex lighting and lightmaps, many light types including flickering, pulsing etc.
• HDR (in all games since ) and SDR/LDR (not in and later) lighting
• Water with refraction, real-time world reflections and fresnel effects
  • Water also supports flow mapping (in all games since )
• Advanced particle systems that can emit sprites or models
• Render-to-texture shadows allow for a large number of characters per scene
• Occluder entities for visibility blocking
• Indoor/Outdoor environments
  • Deformable terrain
  • 3D Skyboxes extend the horizon and add parallax on distant objects
  • Dynamically rendered organics (grass, trees, etc.)
• Subdivision surfaces, diffuse & specular bump maps
• Real-time radiosity lighting
• Real-time cascaded shadow mapping that comes from the skybox (in all games since )
• Effects include but are not limited to: particles, beams, volumetric smoke, sparks, blood, & environmental effects like fog and rain
• Scalability
  • DX8-DX9 hardware supported (DX6-DX9 with modifications and fixed-function shaders)
  • DX11 and later are also supported on some third-party branches.

Warning:DirectX 7 materials and earlier are no longer supported since Source 2007/Source 2009 (except Portal with RTX). Games that uses Left 4 Dead engine branch and later only support DirectX 9 materials.

Note:Source allows up to 8 LOD Models, although it does not have automatic level of detail out of box. Manual LoD is supported, however.

Warning: Counter-Strike: Global Offensive currently does not support level of detail. $lod will be ignored, but the model will still work. Try to avoid using this command in .

Materials System

• Instead of traditional textures, Source defines sets of materials that specify what the object is made from and the texture used for that object. A material specifies how an object will fracture when broken, what it will sound like when broken or dragged across another surface, and what that object's mass and buoyancy are. This system is much more flexible than other texture-only systems
• Materials can interact with objects or NPCs, such as mud or ice for vehicles to slide/lose traction on

Multiplayer Network Code

• Time- and gamer-tested by millions of gamers around the world
• Support for both LAN-based multiplayer and Internet-based multiplayer games
• Prediction analysis for interpolating collision/hit detection
• Optimizations for high-latency, high-packet-loss 56k connections

Advanced Characters

• Detailed and believable characters
• Realistic eyes
  • Focus on player/object, not simply parallel views
  • Proper eye bulge for realistic eye reflections
• Simulated musculature provides outstanding emotions, speech, and body language
• Language independent speech, characters can speak naturally in many languages
• Skeletal/bone system for animation
• Layered animation system can synthesize complex animations out of several pieces

Physics

• Uses Havok physics engine, licensed from Havok Group (now acquired by Microsoft)
• More responsive world with realistic interactions
• Sounds & graphics follow from physics
• AI characters can interact with physically simulated objects
• Ropes/cables, machines, constraint systems, ragdoll physics
• Can be controlled by level design
• Kinematic animated bone followers
• Custom procedural physics controllers
• Vehicles
  • Wheels slip and skid
  • Realistic suspensions with springs on each wheel
  • Realistic leaning during acceleration/deceleration and turning
  • Individually tunable parameters such as horsepower, gearing, max speed, shift speed, tire material, tire friction, spring tension/dampening, etc.
  • Multiple players in a vehicle in multiplayer
  • Hovercraft support for cheaper simulation

Advanced AI

• I/O system allows level designers to control AI
• Sophisticated navigation: characters that run, fly, jump, crouch, climb stairs and ladders, and burrow underground
• AI senses things using sight, sound, and smell
• AI relationships determine friend/foe status of other entities
• Battle AI allows squads of AI characters to operate together, know when to advance, retreat, lay cover fire, etc.

Sound System

• 7.1, 5.1 surround sound, 4 speaker surround

Template:ModernBug

Note:Some Source games (such as Alien Swarm, Portal 2 and Counter-Strike: Global Offensive) may not include options to enable 7.1 surround sound without using console commands.

• High-quality 3D spatialization
• Custom software DSP
• Automatic DSP based on environmental geometry
• Microsoft ADPCM-compressed WAV files
• 16-bit 44.1 KHz (CD Quality), stereo wave data with all features

Warning:48 KHz audio (DVD Quality) is not supported by default. Not to be confused with 44.1 KHz, which is the CD Quality audio.

• MP3 decompression (requires Miles license)
• Support for audio streaming on any wave ^[Clarify]
• Real-time wave file stitching ^[Clarify]
• Pre-authored Doppler effect encoded waves
• Pre-authored distance variant encoded waves
• Commentary system

UI

• Server browser — Displays all active game servers and allows a player to choose which one to participate on. Players can filter and sort server lists in order to speed up the display and selection of a server.
• VGUI — Valve's custom GUI interface mimics most of the Windows controls but is rendered using the Source engine for both in game and out of game uniform UI display. Some features:
  • Dynamic in-game HUD display
  • Many widgets/controls (e.g., buttons, treeview, html control…)
  • Themes/custom visualization allowed
  • Platform independent
  • Localized text (Unicode compliant)
• Panorama (in all games since ) — Introduced in 2018, Valve's new Custom GUI interface that resembles modern web design and authoring (HTML5/CSS/JS). Using .XML and JavaScript files, developers can create dynamic and clean huds and menus and even high-quality in-game intractable panels.

Programming

• All code written in C/C++ using Visual Studio .NET 2003 and later. Easily and quickly derive new entities from existing base classes
• Internal context sensitive performance monitoring system
• Graphics performance measurement tools built into the engine
• Modular code design (via DLLs) allows swapping out of core components for easy upgrading or code replacement
• VScript scripting system allows using external coding languages, such as Squirrel and Lua, in maps to create more complex systems (in all games since ) (also in )

Tools

• HLFaceposer
  • Facial expression tool used to craft speech and emotions
• Valve Hammer Editor
  • WYSIWYG World editor
  • Create world brushes
  • Terrain editor
  • Place detailed world models and AI NPCs
  • Set navigation points/paths for NPCs
  • Place triggers, clip brushes, logic, etc.
  • Allows level designer to hook up I/O between entities to control AI within the game
• Half-Life Model Viewer
  • Full model previewer
  • Rotate models in any direction
  • Set up hit boxes
  • View physics hull
  • View normals
  • Wireframe, shaded or textured view modes
• Studiomdl
  • Model compiler
• VBSP, VRAD, VVIS, VMPI
  • Map compilation tools (bsp, lighting and visibility)
  • VMPI — distributed compilation tool allowing level compiles to be spread across many PCs greatly reducing compile times
• Exporters
  • XSI, Max and Maya .smd exporters for exporting 3D models

Products using Source

Products made by Valve

Release date	Title	Co-developed with	Engine branch	Platforms	Notes
7 Oct 2004	Counter-Strike: Source	Turtle Rock Studios Hidden Path Entertainment (2010 update)	Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	First game to use the Source engine. Remake of Counter-Strike. Hidden Path Entertainment alongside Valve worked on the May 7, 2010 update, which upgraded the game's engine from Source 2006 to 2009 (MP version, later renamed to Source MP), and added 144 (now 146) achievements, a new domination and revenge system similar to Team Fortress 2, player stats and more. Hidden Path Entertainment also worked on the unreleased Xbox 360 port of CS:S, which would later become Counter-Strike: Global Offensive after Valve saw the opportunity during its development to turn the port into a new game. Mac version of the game was later release in June 2010, and Linux in 2013.
16 Nov 2004	Half-Life: Source		Source 2004 (launch) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux	Remaster of Half-Life. It is critically panned by most gamers since 2013 due to the huge amount of bugs that were introduced when the game was updated to Source 2013. Prior to the 2013 update, it received mixed reviews by critics and most gamers, some players are disappointed over the game graphics (especially the textures) that are unchanged from the original, while also having a realistic Source's 3D Skybox and water effects. A unofficial fan remake of Half-Life, called Black Mesa was later started development in response of those criticisms, which was first released in 2012 without any Xen chapters and was much shorter, and later in 2020, a full release with contains the Xen chapters.
16 Nov 2004	Half-Life 2	EA UK (PS3 port)	Source 2004 (launch, ) Source 2007 (only in ) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Original Xbox, Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	Sequel to Half-Life, and later Half-Life: Alyx. Included on The Orange Box. The game was set 20 years after the event of Half-Life, takes place in City 17, which is under Combine control. Prior to its release, it was delayed multiple times, and infamously leaked in Oct 2003. It was among the first games to require Steam in order to play. Half-Life 2's engine branch has been updated multiple times, first in 2007, upgraded to Source 2007 only on consoles, and in 2010, upgraded to Source 2009 on PC, and finally, Half-Life 2 was upgraded to the Source 2013 Singleplayer branch. In November 2024, Valve released a 20th anniversary update, which add Steam Workshop support, fixing several bugs, improved shaders (with option to use classic 2004/2006 particles/effects and Very High shader option), and made Half-Life 2: Lost Coast, Episode One and Episode One playable through Half-Life 2 main menu, without quitting the game and launch it separately on Steam client.
30 Nov 2004	Half-Life 2: Deathmatch		Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Multiplayer component of Half-Life 2. Now runs on Team Fortress 2 branch after 20th anniversary update.
26 Sep 2005	Day of Defeat: Source		Source 2004 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Remake of Day of Defeat. Like Half-Life 2: Lost Coast, it also have features later added to Source 2006, such as HDR lighting.
27 Oct 2005	Half-Life 2: Lost Coast		Source 2004 (launch) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux	Originally as part of Half-Life 2, which was cut at some point before it was released, and was developed after the leak happened but was ultimately cut, then later released in 2005 as a HDR lighting technology demo. It runs on a newer version of Source 2004, introducing new features such as Commentary System and HDR (which was previously introduced on Day of Defeat: Source). Both of these new features are later used in Half-Life 2: Episode One, which runs on Source 2006 engine, and subsequent games & branches after it. As of 2025, it runs on Source 2013 Singleplayer.
1 May 2006	Half-Life Deathmatch: Source		Source 2006 (launch) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux	Multiplayer component of Half-Life: Source. Now runs on Team Fortress 2 branch since February 18, 2025 update.
1 Jun 2006	Half-Life 2: Episode One	EA UK (PS3 port)	Source 2006 (launch) Source 2007 ((only in )) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	The game is the sequel to Half-Life 2, and the story begins after the Citadel reactor core was destroyed, Gordon and Alyx both survived the explosion. When it's come to technical, it used the Source 2006 engine branch at launch, and it is the last Valve game to be released on the Old Engine branch. Included in The Orange Box.
10 Oct 2007	Half-Life 2: Episode Two	EA UK (PS3 port)	Source 2007 (launch, currently used on & ) Source 2013 Singleplayer (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3 Mobile: Android (NVIDIA Shield)	A sequel to Half-Life 2: Episode One. The City 17 has been destroyed, and the Citadel was partially collapsed, Gordon and Alyx has survived the train crash. The game largely take places in White Forest. Story aside, when it's come to technical, it uses the Source 2007 at launch, originally called as The Orange Box engine branch and it is the first iteration of the New Engine branch. Included on The Orange Box.
	Portal			PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3, Nintendo Switch (part of Portal Companion Collection) Mobile: Android (NVIDIA Shield)	A completely new game and IP from Valve, set in the Half-Life universe, and take places in Aperture Laboratories. It is a puzzle-based shooter game, allowing you to create portals, that link to one another on any flat and large enough surface. In 2023, an unofficially remastered version of the game, Portal with RTX, was released, which takes advantage of hardware that support ray-tracing, and adds PBR textures, high polygon models in order to improve the game graphics. Like the other two new games in The Orange Box package, it used the Source 2007 engine at launch.
	Team Fortress 2		Source 2007 (launch, currently used on & ) Team Fortress 2 branch (currently)	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3	Sequel to Team Fortress Classic, focusing on cartoon graphics unlike the pre-release footage/screenshots, which aimed to be more realistic. This is the last game, along with 2 other games as part of The Orange Box pack to use the engine branch that requires Half-Life 2 assets to operate. The console version of the game is no longer updated, as opposed to PC version of the game, which is frequently updated. It has its own version of Source 2013 Multiplayer which is more up to date and has newer features in what's named the Team Fortress 2 branch.
17 Nov 2008	Left 4 Dead	Turtle Rock Studios (under Valve South)	Left 4 Dead engine branch (earlier version)	PC: Windows, Mac Console(s): Xbox 360	A new multiplayer co-op game, with a horror zombie theme. It use a new engine branch which does not require Half-Life 2 assets in order to work, it also adds many new features and introduced VPKs.
17 Nov 2009	Left 4 Dead 2		Left 4 Dead engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360	Originally was planned to be an update for Left 4 Dead, it was later released as standalone game. Like Left 4 Dead, it also runs on the same L4D branch, but much newer. Like TF2, the console version () of the game is no longer updated, as opposed to PC version of the game. This game was also ported to Source 2 back in 2014, but this version remains unreleased to this day, and one of its maps has been remade in Source 2 as a tech demo back in 2010, which its image was leaked in 2014.
19 Jul 2010	Alien Swarm		Alien Swarm engine branch	PC: Windows	A co-op alien shooter, which was a remake of the Unreal Tournament 2004 mod with the same name. It succeeded the Left 4 Dead engine branch and adds new features on its branch.
18 Apr 2011	Portal 2		Portal 2 engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3, Nintendo Switch (part of Portal Companion Collection)	Has its own engine branch, and once again, introduced new features and succeeded Alien Swarm engine branch. Sequel of Portal. For the first time since 2007, the PlayStation 3 version was developed by Valve themselves, and does not suffer various issues that The Orange Box on PS3 had, such as poor optimization, and high-pitched audio issue.
21 Aug 2012	Counter-Strike: Global Offensive	Hidden Path Entertainment	CS:GO engine branch	PC: Windows, Mac, Linux Console(s): Xbox 360, PlayStation 3	Sequel to Counter-Strike: Source, originally developed as a Xbox 360 port of Counter-Strike: Source before Valve eventually turned it into a new Counter-Strike game. The game runs on the CS:GO engine branch, which is based off of the Left 4 Dead engine branch with Portal 2 engine branch code. CS:GO used Source 1 engine until 2023, now uses the new Source 2 engine under the name Counter-Strike 2, replacing CS:GO (except the console version). Console version is no longer updated since 2013, but remains purchasable. Prior to being delisted, it was Free to Play on PC since 2018.
9 Jul 2013	Dota 2		Dota 2 engine branch (Pre-Reborn)	PC: Windows, Mac, Linux	Sequel to 2003's Warcraft III mod, Defense of the Ancients (retroactively called as Dota 1, DotA for short). Formerly using Source until 2015, when it was switched to Source 2, as part of Dota 2's Reborn update. This is also the last Valve game to be released on the Source engine.

Third-Party

Games, tool and mods made by third-party companies and mod teams.

Released

2004 - 2009

Year Title Developer(s) Publisher(s) Engine branch Platforms Notes 2004 Vampire: The Masquerade – Bloodlines Troika Games Activision Source 2004 (Beta) PC: Windows First third-party game to use Source engine. Runs on the earlier, beta version of Source 2004, referred to as the Half-Life 2 Beta/leak (or Source 2003) engine. It uses a proprietary format for the materials and texture files. Also the first Source game to use Bink video, prior to Source 2007. 2004 JBMod TEAM JBMOD TEAM JBMOD Source 2004 (launch) Source 2013 Multiplayer PC: Windows, Linux Earliest Source mod to be created, shortly after the release of Source SDK. It is also the spiritual predecessor to Garry's Mod. The game was later re-released on Steam in 2022, running on Source 2013. 2005 Synergy Synergy Team Synergy Team Source 2006 (pre-Steam) Source 2013 Multiplayer (current) PC: Windows, Mac, Linux A co-op mod that allows you to play the entire Half-Life 2 campaign in Multiplayer. 2005 Dystopia Puny Human Puny Human Source 2013 Multiplayer PC: Windows, Linux 2006 SiN Episodes Ritual Ritual Source 2004 PC: Windows Last game by Ritual Entertainment, having only one out of nine episodes released, prior to the acquisition by MumboJumbo. No new episodes were created after the acquisition. The game runs on mix of both Source 2004 with some beta Source 2006 (or possibly the 2005 version of Lost Coast) code[confirm] (as there are non-functional HDR console commands). 2006 The Ship: Murder Party (MP) The Ship: Single Player Outerlight Ltd. Outerlight Ltd. (original, digital) Mindscape (EU) Mersom (US) Blazing Griffin (current) Source 2006 PC: Windows Specific soundscape sounds can be set to act as "music", letting them be affected by snd_musicvolume 2006 Dark Messiah of Might and Magic Arkane Studios, Ubisoft Annecy () Ubisoft Source 2006 (PC) Source 2007 (Xbox 360) PC: Windows Consoles: Xbox 360 First third-party Source engine game to be released on consoles, specifically, the Xbox 360 (as Dark Messiah of Might and Magic: Elements). 2006 Garry's Mod Facepunch Studios Valve Source 2004 (launch, 1.0) Source 2006 (GMod 10, commercial release) Source 2013 (heavily modified) PC: Windows, Mac, Linux Originally released in 2004 as GMod 1.0 (sometimes refers as Beta release), this is a third-party game (formerly, a Source SDK mod) that was published by Valve (first-party) with the release of GMod 10 and later versions. Unlike previous versions (GMod 9 or earlier), it is not free and requires purchase. When the GMod 13 was released in 2012, it initially ran on Source MP, which was later upgraded to Source 2013. After GMod 13, the game, and its Source 2013 branch transitioned to  Software as a service-like model which meant that GMod will be frequently updated every month, and Facepunch begin to heavily modify the engine by adding experimental support for Alien Swarm engine branch and Portal 2 engine branch or later features, such as VTF 7.5, BSP 21 and 64-bit support, and combining code from both 2013's SP and MP branch[confirm]. 2007 (Mod) 2008 (Steam) Fortress Forever Fortress Forever Development Team, Trepid Studios Fortress Forever Source 2006 Source 2013 Multiplayer (In development) PC: Windows, Linux 2007 Age of Chivalry Team Chivalry Team Chivalry Source 2007 PC: Windows 2007 (Mod) 2008 (Steam) Zombie Panic! Source Zombie Panic! Team Zombie Panic! Team Source 2013 Multiplayer (current) PC: Windows, Linux 2007 INSURGENCY: Modern Infantry Combat Insurgency Development Team New World Interactive Source 2006 PC: Windows 2008 D.I.P.R.I.P. EXOR Studios EXOR Studios Source 2007 PC: Windows 2009 Zeno Clash ACE Team Iceberg Interactive, Tripwire Interactive Source 2009 (PC) Left 4 Dead engine branch (Xbox 360) PC: Windows Consoles: Xbox 360 Xbox 360 version uses Left 4 Dead engine branch and released in 2010. Year Title Developer(s) Publisher(s) Engine branch Platforms Notes

2010 - 2019

Year Title Developer(s) Publisher(s) Engine branch Platforms Notes 2010 Bloody Good Time Outerlight Ltd. Ubisoft Source 2007 PC: Windows Consoles: Xbox 360 2010 (Website) 2012 (Steam) Vindictus devCAT NEXON Korea Corp. & NEXON America Inc. Source 2006 (heavily modified) PC: Windows Heavily modified, and uses proprietary file format to store game files. Also support DirectX 11. Even though Source 2007 and Source 2009 were available for licensing by the time the game was released, the game was built on Source 2006 instead. 2010 Blue Portals Reepblue Reepblue Source 2013 PC: Windows 2011 Dino D-Day 800 North and Digital Ranch 800 North and Digital Ranch Portal 2 engine branch PC: Windows Originally Left 4 Dead engine branch when it was released, later upgraded to Portal 2 engine branch. 2011 E.Y.E: Divine Cybermancy Streum On Studio Streum On Studio Source 2007 PC: Windows 2011 Nuclear Dawn GameConnect, InterWave Studios Iceberg Interactive Left 4 Dead engine branch PC: Windows 2011 No More Room in Hell No More Room in Hell Team Lever Games Source 2013 PC: Windows 2011 Postal III Trashmasters Akella Source 2009 PC: Windows This game is infamous for being the worst commercially released Source engine game at all time, leading to Akella eventually becoming bankrupt. Originally delisted on Steam in Dec 2022 due to ActControl DRM server issues, which was later resolved after the remains of Akella gave RWS limited access to the game store page, and, RWS, with Zoom Platform together patch the game with bug and crash fixes by injecting the p3.dll file into the game, plus making it DRM-Free. 2009 (Mod) 2012 (Steam) Dear Esther The Chinese Room, Robert Briscoe The Chinese Room, Secret Mode Source 2007 (Mod) Source 2009 (Steam) PC: Windows The 2012 version of the game, which runs on Source 2009 is no longer sold on Steam, being replaced by Landmark Edition remaster that runs on Unity engine. It is still available on Humble Store, however. The original 2009 mod of this game is also still available on ModDB. 2012 Revelations 2012 Dark Artz Entertainment Dark Artz Entertainment Left 4 Dead engine branch PC: Windows 2012 Hybrid 5th Cell Xbox Game Studios (formerly Microsoft Studios) Left 4 Dead engine branch Consoles: Xbox 360 Console-exclusive title. 2013 (delisted) Tactical Intervention FIX Korea, Co.LTD, FIX Games, Co. LTD FIX Games, Co. LTD Portal 2 engine branch[confirm] PC: Windows No longer available. 2013 The Stanley Parable Galactic Cafe Galactic Cafe Portal 2 engine branch PC: Windows, Mac, Linux This modified branch was later used in The Beginner's Guide. A sequel, expanded and re-imagination of The Stanley Parable was later released in 2022 as The Stanley Parable: Ultra Deluxe, which runs on the Unity engine. 2013 Counter-Strike Online 2 Nexon Nexon Source 2009 or Source 2013 (heavily modified)[confirm] PC: Windows Currently unknown whether it uses Source 2009 or 2013. Like Counter-Strike Online, it's also used proprietary file format to store its game files. The engine used in this game have new features such as CSM shadows and LZMA-compressed VTF files. 2014 (delisted) Consortium Interdimensional Games Interdimensional Games Portal 2 engine branch PC: Windows Delisted in favor of the remaster running on Unreal Engine 4. Purchasing the remaster (or Consortium VR) will give you access to the 2014 Source version. 2014 Blade Symphony Puny Human Puny Human Portal 2 engine branch (confirm) PC: Windows Originally released as a Early Access game in 2013. 2014 Insurgency New World Interactive New World Interactive CS:GO engine branch (earlier version) PC: Windows 2014 Titanfall Respawn Entertainment Electronic Arts Titanfall branch PC: Windows Consoles: Xbox 360, Xbox One Likely delisted on PC (Origin/EA Play and Steam) due to low player count and constant server issues due to being DDoS attacked, plus the game also have multiple security vulnerabilities. Existing owners can still play the game. The engine was heavily modified from Portal 2 engine branch. Also first Source engine game to be released for eighth-gen consoles. 2014 Contagion Monochrome, Inc Monochrome, Inc Left 4 Dead engine branch PC: Windows Spiritual successor to Zombie Panic! Source. 2014 (Steam) NEOTOKYO° STUDIO RADI-8 STUDIO RADI-8 Source 2006 PC: Windows Originally released in 2009 as a SourceMod that requires Source SDK Base 2006 to be installed, later released on Steam in 2014, which is completely standalone. 2014 (Steam) Fistful of Frags Hoobalugalar_X Raptor Byte Source 2013 PC: Windows, Mac, Linux Originally released as a mod in 2007 on ModDB. 2014 Lambda Wars Vortal Storm Vortal Storm Alien Swarm engine branch PC: Windows 2014 Team Fortress 2 Classic Eminoma Team Eminoma Team Source 2013 Multiplayer PC: Windows First Team Fortress 2 Source mod to be released. A newer version running on Team Fortress 2 branch is in development. 2015 Portal Stories: Mel Prism Game Studios Ltd. Prism Game Studios Ltd. Portal 2 engine branch (earlier version) PC: Windows, Mac, Linux Requires Portal 2 to be installed to play. 2015 (Steam) Codename Cure Hoobalugalar_X Raptor Byte Source 2013 PC: Windows, Mac, Linux Originally released as a mod in 2013 on ModDB. 2015 Double Action Double Action Factory Double Action Factory Source 2013 Multiplayer PC: Windows, Linux 2015 The Beginner's Guide Everything Unlimited Ltd. Everything Unlimited Ltd. Portal 2 engine branch PC: Windows, Mac, Linux Based off modified version of The Stanley Parable engine, which itself was also modified from Portal 2 engine branch. 2016 Wilson Chronicles Frere d'Arme Frere d'Arme Source 2013 PC: Windows 2016 INFRA Loiste Interactive Loiste Interactive Portal 2 engine branch PC: Windows 2016 Titanfall 2 Respawn Entertainment Electronic Arts Titanfall branch PC: Windows Consoles: Xbox One, PlayStation 4 A sequel to Titanfall. First Titanfall game to have a singleplayer campaign. 2016 Day of Infamy New World Interactive New World Interactive CS:GO engine branch (earlier version) PC: Windows, Mac, Linux 2017 Alien Swarm: Reactive Drop Reactive Drop Team Reactive Drop Team Alien Swarm engine branch PC: Windows 2017 Entropy : Zero Breadman Breadman Source 2013 Singleplayer PC: Windows 2018 Hunt Down the Freeman Royal Rudius Entertainment Royal Rudius Entertainment Source 2013 Multiplayer PC: Windows In later updates, the game was transfered from Source 2013 SP to MP codebase. The engine has been heavily modified over time, adding feature such as: Parallax Corrected Cubemaps, PBR textures, WebM (replaces Bink), FMOD for audio, and much more... This game was largely criticized by players for numerous reasons like its bugs, poor design, developers of this game not having been paid. 2019 Apex Legends Respawn Entertainment Electronic Arts Titanfall branch PC: Windows Heavily modified, like previous Titanfall games. Replaced HBAO+ ambient occlusion and MSAA anti-aliasing to SSAO and TAA respectively, aswell as being the only Source game that supports DirectX 12 (Direct3D 12) natively. 2019 Open Fortress Open Fortress Development Team Open Fortress Development Team Source 2013 Multiplayer PC: Windows The fourth Team Fortress 2 Source mod to be released, with TF2Vintage having been released in 2017, and Team Deathmatch Classic being launched in 2018. 2019 Pre-Fortress 2 Pre-Fortress 2 Team Pre-Fortress 2 Team Source 2013 Multiplayer PC: Windows The fifth Team Fortress 2 Source mod to be released. Year Title Developer(s) Publisher(s) Engine branch Platforms Notes

2020 - present

Year Title Developer(s) Publisher(s) Engine branch Platforms Notes 2020 Black Mesa Crowbar Collective Crowbar Collective Xengine PC: Windows, Linux Black Mesa was originally released in 2012 as a mod running on Source 2007, and later released on Steam in 2015 as a Early Access title, upgrading it to Source 2013, which was later heavily modified with new features, creating a custom branch named Xengine. Fan remake of Half-Life. 2020 G-String Eyaura LunchHouse Software Source 2013 PC: Windows 2021 Portal Reloaded PORTAINIS PORTAINIS Portal 2 engine branch PC: Windows, Mac, Linux 2022 Divinia Chronicles: Relics of Gan-Ti Team Monkey Team Monkey Source 2013 Singleplayer PC: Windows 2022 BrainBread 2 Reperio Studios Reperio Studios Source 2013 Multiplayer PC: Windows, Mac, Linux Originally available as Early Access in 2016. 2022 Entropy : Zero 2 Breadman Breadman Source 2013 Singleplayer ( Mapbase) PC: Windows Sequel to Entropy : Zero. 2022 They Hunger: Source Post-GoldSOURCE Post-GoldSOURCE Source 2013 Singleplayer PC: Windows 2022 Jabroni Brawl: Episode 3 Team Jabroni Team Jabroni CS:GO engine branch PC: Windows, Linux 2023 Treason Tomorrow Software Klaus Veen Source 2013 Multiplayer PC: Windows 2023 Mistake: Source NOUG4AT Unified Network Source 2013 Singleplayer PC: Windows 2023 Swelter SnowDropEscape development team Eduard Rostovtsev, SnowDropEscape development team Source 2013 Singleplayer PC: Windows, Linux 2024 Portal: Revolution Second Face Software Second Face Software Strata Source PC: Windows, Linux First Source game to use Strata Source engine, a heavily modified version of Source which features many changes and improvements to bring it closer to modern standards. 2025 The Cleaning Game Michael Rumpff Michael Rumpff Portal 2 engine branch PC: Windows

In development (Unreleased)

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

Release Date	Title	Developer(s)	Publisher(s)	Engine branch	Platforms	Notes
2025	Military Conflict: Vietnam	Dustfade	Dustfade	CS:GO engine branch	PC: Windows, Linux	Early access since 2022, planned to be released around 2025. Quote from Military Conflict: Vietnam Steam page: The game will stay in Early Access until all planned initial content is released, the current estimate of which is during 2025.
TBA	CS:Legacy	CS:Legacy Team	TBA	Source 2013 (sub-branch TBD)	PC: TBA	Remake of Counter-Strike, developed by (some) former CSPromod developers. Runs on modified version of Source 2013 (presumably Team Fortress 2 branch), with the game renderer completely rewritten. Features PBR shaders, CSM and other graphical improvements.
TBA	Half-Life 2 RTX	Orbifold Studios	Orbifold Studios	Source 2013 Singleplayer (with Mapbase)	PC: Windows	Second Source game to use RTX Remix technology which adds ray-tracing support along with (PBR textures, etc.). The mod also uses Mapbase. A demo version was released on March 18, 2025.
TBA	Infestus	Team Infestus	Team Infestus	Source 2013 Multiplayer	PC: Windows, Mac, Linux	Currently in closed beta.
TBA	Momentum Mod	Momentum Team	Momentum Team	Strata Source	PC: Windows, Linux	Currently in closed beta.
TBA	Portal 2: Community Edition	P2:CE Team	P2:CE Team	Strata Source	PC: Windows, Linux	Currently in closed beta.
TBA	PUNT	LunchHouse Software	LunchHouse Software	Portal 2 engine branch (heavily modified)	PC: Windows

More Third-party Source Engine games

• More Source mods

See Also

• Wikipedia:Source (game engine)
• Source Engine Features
• Source SDK
• Source SDK Documentation
• Source SDK 2013

External links

Todo: How relevant and current these guides are? Keep links to current manuals instead of all at appropriate places. Use Special:LinkSearch for this.

• Source Engine Tutorials https://www.sourcemodding.com/tutorials/source
• Tutorials for Source Engine https://gamebanana.com/tuts/games/35
• Tutorials - Source - Mod DB https://www.moddb.com/engines/source/tutorials
• GitHub Issues page - for engine bug reports.