View source for Source/Engine versions

{{TabsBar|main=Engine versions}}
List of {{src|4}} engine versions and build numbers. Source Engine build number is the number of days since November 7, 1998 (with the exceptions of Half-Life 2 leak and VTMB, which are September 30, 2003 ({{hl2|1}} original planned release date) and August 24, 2003 respectively, aswell as E3 builds of Half-Life 2 are based on numbers of days since October 24, 1996 - same as GoldSrc/Hammer).

{{Note|Since later versions of {{l4dbranch|1}} (in March 2009), and all games since {{as|1}}, Protocol version number are tied to "PatchVersion", while {{l4d2|1}} are tied to "NetworkVersion".}}
{{Note|Since mid/late 2013, newer versions of almost all {{src13|1}} games no longer display {{code|Exe build date}} on console, and no longer display the actual engine build number based on days since November 7, 1998. Instead the build numbers are now tied to PatchVersion, and all Build (exe) are either based on the date the Steam depot was updated, the {{code|hl2.exe}} digital signature date, or inside {{code|engine.dll}}.}}

<!-- Originally written by ExtraVirus. New info added by kr0tchet (leonidakarlach) -->

{|class="standard-table" style="width: 100%; text-align: center;"
|- style="z-index:1; position:sticky; top:0;border:2px solid #525252;"
{{EngineBuildTableCaption|engine=Source}}
|- id="-7"
| -7 ||  || [[Half-Life: Source]], [[Counter-Strike: Source]] || {{src04|1}} (Beta) || Protocol Version 2 || Sep 23 2003 || Leaked alongside [[Half-Life 2]] on October 2003.
|- id="-4"
| -4 ||  || [[Half-Life 2]]  || {{src04|1}} (Beta) || Protocol Version 2 || Sep 26 2003 || Infamous October 2003 leak build.
|- id="466"
| 466 ||  || {{vtmb|1}}  || {{src04|1}} (Beta) || Protocol Version 1 || Dec 2 2004 || VTMB engine runs on modified version of Source similar to {{hl2|1}} leak (also known as Half-Life 2 Beta).
|- id="2034"
| 2034 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || May 20 2002 || Half-Life 2 [https://www.youtube.com/watch?v=8CoMdbnJwvE E3 2002 demo build].
|- id="2106"
| 2106 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 3 || Aug 13 2004 || CS:S Version for Internet Cafe
|- id="2153"
| 2153 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 5 || Sep 29 2004 || [[Half-Life 2]] Collector's Edition Version
|- id="2187"
| 2187 ||  || [[Half-Life 2]], [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 6 || Nov 4 2004 || Release build
|- id="2213"
| 2213 ||  || [[Half-Life 2: Deathmatch]] || {{src04|1}} || Protocol Version 7 || Dec 1 2004 || 
|- id="2215"
| 2215 ||  || [[Half-Life 2]], [[Half-Life 2: Deathmatch]], [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Nov 30 2004 || 
|- id="2217"
| 2217 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{src04|1}} || Protocol Version 7 || Dec 2 2004 || 
|- id="2229"
| 2229 ||  || [[Half-Life 2]] || {{src04|1}} || Protocol Version 7 || Dec 15 2004 || 
|- id="2230"
| 2230 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Dec 15 2004 || 
|- id="2259"
| 2259 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Jan 30 2005 || 
|- id="2279"
| 2279 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Feb 16 2005 || 
|- id="2293"
| 2293 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Feb 21 2005 || 
|- id="2301"
| 2301 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Feb 27 2005 || 
|- id="2342"
| 2342 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Mar 24 2003 || used for creating demo of e3_town_04 map (e3_town_02 demo).
|- id="2345"
| 2345 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Mar 27 2003 || used for creating demo of e3_outpost_test map (e3_outpost_1 demo).
|- id="2364"
| 2364 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Apr 15 2003 || used for creating demo of e3_seacliff map (e3_seacliff_1b demo).
|- id="2371"
| 2371 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Apr 22 2003 || used for creating demo of e3_seafloor_01 map (e3_seafloor_sawyer1 demo).
|- id="2378"
| 2378 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Apr 29 2003 || used for creating test version of Kleiner's Lab, Phystown and Bugbait videos (e3_alyx, e3_phys_01 and e3_bugbait_01 demos).
|- id="2379"
| 2379 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || Apr 30 2003 || used for creating test versions of Kleiner's Lab video (e3_lab_02 and 03 demos).
|- id="2390"
| 2390 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || May 11 2003 || used for creating Tunnels (final and test versions), Barricade and Bugbait videos.
|- id="2391"
| 2391 ||  || [[Half-Life 2]] || {{src04|1}} (Beta) || Protocol Version 2{{confirm}} || May 12 2003 || Half-Life 2 [https://www.youtube.com/watch?v=CaHtOISsLT4 E3 2003 demo build].
|- id="2433"
| 2433 ||  || [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Jul 6 2005 || 
|- id="2455"
| 2455 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{src04|1}} || Protocol Version 7 || Jul 28 2005 || 
|- id="2459"
| 2459 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{src04|1}} || Protocol Version 7 || Aug 1 2005 || 
|- id="2495"
| 2495 ||  || [[Half-Life: Source]] || {{src04|1}} || Protocol Version 7 || Sep 5 2005 || 
|- id="2496"
| 2496 ||  || [[Half-Life: Source]] || {{src04|1}} || Protocol Version 7 || Sep 6 2005 || 
|- id="2497"
| 2497 || 1.0.0.0 (DOD:S) || [[Half-Life 2]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Day of Defeat: Source]] || {{src04|1}} || Protocol Version 7 || Sep 8 2005 || Initial release of {{dods|1}} runs on this version.</br>Source 2004 was updated to add [[HDR]], DirectX 9.0+/{{Code|[[dxlevel 95]]}}, [[Commentary System]] (unused in DOD:S), and more features.
|- id="2519"
| 2519 ||  || [[Counter-Strike Source]], [[Half-Life 2: Deathmatch]], [[Day of Defeat: Source]] || {{src04|1}} || Protocol Version 7 || Sep 30 2005 || Russian copy of {{css|1}} (which also includes {{hl2dm|1}} and {{dods|1}}).
|- id="2547"
| 2547 ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Oct 28 2005 || {{hl2lc|1}} was released, aside from HDR and other features introduced in DOD:S, Commentary System is used in {{hl2lc|1}}. 
|- id="2578"
| 2578 ||  || [[Half-Life 2]], [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Nov 28 2005 || Last versions with old version of "Friends" feature. This older version of "Friends" no longer works as it relies on old deprecated Steam API or old Steam servers which no longer exist.
|- id="2596"
| 2596 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Counter-Strike: Source]] || {{src04|1}} || Protocol Version 7 || Dec 16 2005 || "Friends" feature under construction, being replaced with "Friends Beta" (later renamed to just "Friends"). Users will see this message when opening the Friends menu: 

{{Quote|''The Friends network is undergoing repairs right now. We will send out news when the system is ready to use again. Sorry for the inconvenience!''
}}
|- id="2601"
| 2601 ||  || [[Half-Life 2]] || {{src04|1}} || Protocol Version 7 || Dec 2 2005 || 64-bit build
|- id="2602"
| 2602 ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Dec 22 2005 || 64-bit build
|- id="2629"
| 2629 ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Jan 18 2006 || "Friends" feature still under construction, being replaced with "Friends Beta" (later renamed to just "Friends").
|- id="2629-2"
| 2629<!-- same build--> ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Jan 30 2006 || "Friends Beta" released. This build of Half-Life 2 is most likely the Steam "beta" branch.</br>The Friends Beta client still works in the latest version of Steam (as of 2025), but it is partially functional and buggy due to using deprecated Steam API features. For example, sending messages to friends work, but the sent message only appears in the Steam client and not in the game itself.</br>The Friends feature was also prone to crashing when trying to "View user details", compared to the March/April 2006 build.
|- id="2643"
| 2643 ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Feb 1 2006 || 
|- id="2672"
| 2672 ||  || [[Half-Life 2]], [[Half-Life 2: Lost Coast]] || {{src04|1}} || Protocol Version 7 || Mar 2 2006 || 
|- id="2700"
| 2700</br><small>(Supposed)</small> ||  || {{sineps|1}} || {{src04|1}} || Protocol Version 7 || Mar 30 2006 || Pre-release build, not playable (lacks client.dll/server.dll for this build).
|- id="2707"
| 2707 ||  || [[Half-Life: Source]], [[Half-Life 2]], [[Half-Life 2: Lost Coast]], [[Half-Life 2: Deathmatch]], [[Counter-Strike: Source]], [[Day of Defeat: Source]] || {{src04|1}} || Protocol Version 7 || Apr 6 2006 || Last version of Source 2004 used in Valve games. Half-Life 2 continues to run on this engine until 2010, when it was upgraded to {{src09|1}}. Half-Life 2: Lost Coast and Half-Life: Source also runs on this version until 2013 SteamPipe update.</br>Any builds of Half-Life 2, Half-Life 2: Lost Coast and/or Half-Life: Source between 2733 to 4044 are consider a Source 2006 mod, or an pirated versions of the game made to run on Source 2006 (which was commonly bundled with pirated copies of {{css|1}} v34), and [https://www.speedrun.com/hl2/news/2x20rg6w not an official release], since those games never get updated to 2006 engine (both games are last updated in April 6, 2006, with HL2:LC last changelog dated back to January 2006). These games did get a minor update in 2007 which basically mount {{code|half-life 2 game dialog.gcf}} file, which removes the "Friends" menu as Steam Overlay replaced most of it's functionality.
|- id="2708"
| 2708 ||  || {{sineps|1}} || {{src04|1}} || Protocol Version 7 || Apr 8 2006 || Pre-release build
|- id="2722"
| 2722 ||  || {{sineps|1}} || {{src04|1}} || Protocol Version 7 || May 5 2006 || Initial release for {{sineps|1}}.
|- id="2722"
| 2722 ||  || {{sineps|1}} || {{src04|1}} || Protocol Version 7 || Jul 14 2006 || Last version for {{sineps|1}}.
|- id="2733"
| 2733 ||  || [[Half-Life 2: Episode One]], [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || May 2 2006 || First Episode One ({{src06|1}}) build.
|- id="2737"
| 2737 ||  || [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || May 6 2006 || 
|- id="2761"
| 2761 ||  || [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || May 30 2006 || Last version to support Windows 98/ME. Possibly {{hl2ep1|1}} launch build.
|- id="2803"
| 2803 ||  || [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || Jul 11 2006 || Build shown on EP1 Hopwire weapon [https://www.youtube.com/watch?v=jn1TjZzO9Yk video]
|- id="2894"
| 2894 ||  || [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || Jul 14 2006 || 
|- id="2915"
| 2915 ||  || Source Particle Benchmark || {{src07|1}} Alpha || Protocol Version 7 || Oct 31 2006 || 
|- id="2940"
| 2940 ||  || Dark Messiah of Might & Magic Single Player || {{src06|1}} || Protocol Version 7 || Nov 28 2006 || 
|- id="2949"
| 2949 ||  || [[Half-Life 2: Episode One]], [[Counter-Strike: Source]], [[Garry's Mod]] (v10) || {{src06|1}} || Protocol Version 7 || Dec 6 2006 || 
|- id="2959"
| 2959 ||  || [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || Dec 16 2006 || 
|- id="2992"
| 2992 ||  || [[Half-Life Deathmatch: Source]] || {{src06|1}} || Protocol Version 7 || Jan 16 2007 || 
|- id="3048"
| 3048 ||  || [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || Jul 7 2007 || 
|- id="3152"
| 3152 ||  || [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life Deathmatch: Source]], [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || Jun 25 2007 || 
|- id="3181"
| 3181 ||  || [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || Jul 24 2007 || 
|- id="3188"
| 3188 ||  || [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life Deathmatch: Source]], [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || Jul 31 2007 || Removed "[https://tcrf.net/Half-Life_2_(Windows)/Revisional_Differences#Friends_Menu Friends]" menu option in favor of Steam overlay, which was introduced back when [[Steam Community]] update was released along with Steam client update in same day which add in-game overlay (August 2007). This change also retroactively applies to {{hl2|1}} despite it never received engine updates since April 2006, since Valve added {{code|half-life 2 game dialog.gcf}} (which was also introduced in 2007), overriding {{code|GameMenu.res}} from {{code|source engine.gcf}} and removing the "Friends" option from menu.
|- id="3198"
| 3198 ||  || [[Half-Life 2: Episode Two]], [[Team Fortress 2]], {{p3|1}} (leak)|| {{src07|1}} Beta || Protocol Version 7 || Aug 10 2007 || Postal III leaked build.</br>Old Engine movement (no ABH, only bunnyhopping). Team Fortress 2 build on this leak is unplayable.
|- id="3219"
| 3219 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Portal]], [[Team Fortress 2]] (Xbox 360) || {{src07|1}} || Protocol Version 8 || Aug 31 2007 || {{tob|2}} on {{x360|1}}. The PC version of [[Half-Life 2]] and Episode One continues to use Source 2006 engine.
|- id="3224"
| 3224 ||  || [[Half-Life 2: Episode One]], [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || Sep 5 2007 || Included in {{tob|2}} (PC).
|- id="3236"
| 3236 ||  || [[Team Fortress 2]] (PC) || {{src07|1}} Beta || Protocol Version 8 || Sep 17 2007 || 
|- id="3239"
| 3239 ||  || [[Team Fortress 2]] || {{src07|1}} Beta ||                                          ? || Sep 20 2007 || 
|- id="3240"
| 3240 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 8 || Sep 20 2007 || TF2 Russian release (Buka)
|- id="3258"
| 3258 ||  || [[Half-Life 2: Episode Two]], [[Portal]] || {{src07|1}} || Protocol Version 11 || Oct 9 2007 || {{tob|2}} (PC) launch version.
|- id="3264"
| 3264 ||  ||  [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life 2: Episode One]], [[Half-Life 2: Deathmatch]] || {{src06|1}} || Protocol Version 7 || Oct 15 2007 || 
|- id="3285"
| 3285 ||  || [[Portal]] || {{src07|1}} || Protocol Version 14 || Oct 10 2007 || 
|- id="3300"
| 3300 ||  || [[Half-Life 2: Episode Two]], [[Portal]] || {{src07|1}} || Protocol Version 14 || Nov 20 2007 || 
|- id="3338"
| 3338 ||  || [[Half-Life 2: Episode Two]] || {{src07|1}} || Protocol Version 14 || Dec 28 2007 || 
|- id="3343"
| 3343 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || Jan 2 2008 || 
|- id="3366"
| 3366 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || Jan 25 2008 || 
|- id="3412"
| 3412 ||  || [[Half-Life 2: Episode Two]] || {{src07|1}} || Protocol Version 14 || Mar 11 2008 || 
|- id="3420"
| 3420 ||  || [[Portal]], [[Team Fortress 2]], [[Half-Life 2: Episode Two]] || {{src07|1}} || Protocol Version 14 || Mar 19 2008 || 
|- id="3429"
| 3429 ||  || [[Half-Life 2: Episode Two]] || {{src07|1}} || Protocol Version 14 || Mar 28 2008 || 
|- id="3432"
| 3432 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || Mar 31 2008 || 
|- id="3467"
| 3467 ||  || [[Half-Life 2: Episode Two]], [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || May 6 2008 || 
|- id="3530"
| 3530 ||  || [[Portal]], [[Half-Life 2: Episode Two]], [[Source SDK Base 2007]], [[Day of Defeat: Source]], [[Garry's Mod]] (v11), [[Team Fortress 2]], [[Source Dedicated Server|Team Fortress 2 Dedicated Server]]  || {{src07|1}} || Protocol Version 14 || Jul 8 2008 || 
|- id="3531"
| 3531 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Half-Life Deathmatch: Source]], [[Source SDK Base 2006]], [[Source Dedicated Server]] || {{src06|1}} || Protocol Version 7 || Jul 8 2008 || 
|- id="3539"
| 3539 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || Jul 16 2008 || 
|-
| 3575 ||  || [[Half-Life 2: Episode Two]], [[Day of Defeat: Source]], Zombie Panic: Source, [[Team Fortress 2]], [[Garry's Mod]] (v11) || {{src07|1}} || Protocol Version 14 || Aug 21 2008 || 
|-
| 3642 || 1.0.0.0 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 36 || Oct 28 2008 || Retail, pre-certification build.
|-
| 3658 || 1.0.0.5 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 37 || Nov 12 2008 || Pre-release build, only includes {{code|client.dll}}.
|-
| 3663 || 1.0.0.5 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 37 || Nov 17 2008 || Release build.
|-
| 3666 || 1.0.0.5 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 37 || Nov 20 2008 || 
|-
| 3681 || 1.0.0.7 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 37 || Dec 5 2008 || 
|-
| 3693 ||  || [[Half-Life 2: Episode One]] || {{src06|1}} || Protocol Version 7 || Dec 17 2008 || 
|-
| 3698 ||  || [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || Dec 21 2008 || 
|-
| 3716 || 1.0.0.8 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 38 || Jan 9 2009 ||  Released in March 25, 2009.
|-
| 3730 || 1.0.0.9</br>1.0.1.0 || [[Left 4 Dead]], [[Left 4 Dead 2]] (Beta?) || {{l4dbranch|1}} || Protocol Version 38 || Jan 23 2009 || Last version to have separate protocol version, before tied to PatchVersion.
|-
| 3740 ||  || [[Team Fortress 2]], [[Portal]] || {{src07|1}} || Protocol Version 14 || Feb 2 2009 || 
|-
| 3755 ||  || [[Team Fortress 2]] || {{src07|1}} or {{srcmp|1}} || Protocol Version 14 || Feb 17 2009 || Likely earliest version of Source MP (at the time was Source 2009, but it use MP-specific binaries), due to different SteamIDs scheme. Updated the engine to report [[SteamID]]s using the {{code|Steam_0}} format instead of {{code|Steam_1}} (like {{l4dbranch|1}} and above). This change was eventually reverted due to breaking games & mods such as {{gmod|1}}.
|-
| 3777 || 1.0.1.0 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 1010 || Mar 11 2009 || Protocol version are now tied to {{code|PatchVersion}}. Old demos from release build up to Jan 23, 2009 cannot be viewed without downgrading the game, or edit {{Code|steam.inf}}, and change PatchVersion to 37 (to view demos from launch version) or 38 (to view demos made in Jan - Feb 2009).
|-
| 3790 || 1.0.1.1 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 1011 || Mar 24 2009 ||
|-
| 3790 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Apr 11 2009 || 
|-
| 3791 ||  || [[Half-Life 2: Episode Two]], [[Portal]] || {{src07|1}} || Protocol Version 14 || Mar 25 2009 || 
|-
| 3846 ||  || [[Half-Life 2: Episode One]], [[Counter-Strike: Source]] || {{src06|1}} || Protocol Version 7 || May 19 2009 || 
|-
| 3847 ||  || [[Team Fortress 2]] || {{src07|1}} or {{srcmp|1}} || Protocol Version 14 || May 20 2009 || 
|-
| 3861 ||  || [[Day of Defeat: Source]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Jun 3 2009 || Before 2011 SDK update, the MP branch was simply named as 2009 branch, but it used separate binaries ({{code|multiplayer ob binaries.gcf}} instead of {{code|source 2007 binaries 2.gcf}}, the latter which is actually 2009 SP branch binaries).
|-
| 3881 || 1.0.1.4 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 1014 || Jun 23 2009 || 
|-
| 3887 || 1.0.1.4 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 1014 || Jun 30 2009 || 
|-
| 3908 || 1.0.1.4 || [[Left 4 Dead]] || {{l4dbranch|1}} || Protocol Version 1014 || Jul 20 2009 || 
|-
| 3939 || 1.0.1.4 || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Aug 20 2009 || 
|-
| 3943 ||  || [[Half-Life 2: Episode Two]], [[Day of Defeat: Source]], Synergy, [[Portal]](+Prelude), Zombie Panic: Source, D.I.P.R.I.P. Warm Up, [[Garry's Mod]] (v11), Smashball, Age of Chivalry || {{src07|1}} || Protocol Version 14 || Sep 2 2009 || 
|-
| 3945 ||  || [[Half-Life 2: Episode One]], [[Counter-Strike: Source]], Dystopia, [[Half-Life Deathmatch: Source]], [[Half-Life 2: Deathmatch]], Eternal Silence, Half-Life 2: Capture the Flag, [[Garry's Mod]] (v10) || {{src06|1}} || Protocol Version 7 || Aug 26 2009 || 
|-
| 3971 ||  || [[Team Fortress 2]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Sep 21 2009 || 
|-
| 4010 ||  || [[Left 4 Dead 2]] || {{l4dbranch|1}} ||                                          ? || Nov 4 2009 || 
|-
| 4013 ||  || [[Day of Defeat: Source]], [[Team Fortress 2]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Nov 2 2009 || 
|- id="4044"
| 4044 || 1.0.0.34 (CS:S) || [[Source SDK Base 2006]], [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life 2: Deathmatch]] || {{src06|1}} || Protocol Version 7 || Dec 3 2009 || Last Old Engine build, CS:S 4044 is CS:S v34 (last version of CS:S on Old Engine), last SDK Base 2006 version
|-
| 4097 ||  || [[Team Fortress 2]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Jan 25 2010 || 
|-
| 4100 ||  || Unknown game || {{src06|1}} || Protocol Version 7 || Jan 28 2010 || 
|- id="4104"
| 4104 ||  || [[Half-Life 2: Episode Two]], [[Source SDK Base 2007]] || {{src07|1}} || Protocol Version 14 || Feb 1 2010 || Last Source 2007 build, last SDK Base 2007 version, [[Black Mesa]] mod runs on this version.
|-
| 4106 ||  || Unknown game<!-- cannot be L4D cuz it use different protocol number --> || {{src07|1}} || Protocol Version 14 || Feb 3 2010 || 
|-
| 4121 ||  || [[Left 4 Dead 2]] || {{l4dbranch|1}} ||                                          ? || Mar 28 2010 || 
|-
| 4190 ||  || [[Team Fortress 2]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Apr 28 2010 || 
|- id="4197"
| 4197 ||  || [[Counter-Strike: Source]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || May 5 2010 || CS:S New Engine Beta (co-developed by Hidden Path Entertainment)
|- id="4209"
| 4209 ||  || [[Counter-Strike: Source]] || {{srcmp|1}}<small></br>(referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || May 17 2010 || 
|- id="4218"
| 4218</br><small>(Supposed)</small> ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]] || {{src09|1}} || Protocol Version 15 || May 26 2010 || New Engine - Mac OS X. Half-Life 2 was upgraded to the 2009 engine.
|- id="4231"
| 4231 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Counter-Strike: Source]] || {{src09|1}}</br>{{srcmp|1}}<small></br>(MP formerly was referred to as Source 2009 at the time before 2011)</small> || Protocol Version 15 || Jun 10 2010 || New Engine - Windows, first CS:S New Engine version publicly released. Half-Life 2 was upgraded to the 2009 engine on Windows, while CS:S upgraded to the MP branch (but are simply referred to as 2009 at the time, despite using MP binaries).
|-
| 4260 || 1.0.0.41 (CS:S) || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Jul 7 2010 || 
|-
| 4276 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Jul 23 2010 || 
|-
| 4295 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Garry's Mod]] (v12), [[Portal]](+Prelude) || {{src09|1}} || Protocol Version 15 || Aug 11 2010 || 
|- id="4296"
| 4296 ||  || [[Half-Life 2]] || {{src09|1}} || Protocol Version 15 || Aug 12 2010 || 
|-
| 4296 ||  || [[Postal III]] ({{360|2}}) || {{src07|1}} or {{src09|1}} || Protocol Version 14 || Aug 12 2010 || Postal III cancelled Xbox 360 build. Appears to be demonstrated at [https://www.youtube.com/watch?v=AHZWIPb5-9A Gamescom 2010].
|- id="4307"
| 4307 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Aug 24 2010 || 
|- id="4325"
| 4325 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Sep 10 2010 || 
|- id="4349"
| 4349 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Oct 4 2010 || 
|- id="4364"
| 4364 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Jan 6 2010 || 
|-
| 4394 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Nov 18 2010 || 
|-
| 4421 ||  || [[Counter-Strike: Source]] || {{src09|1}} || Protocol Version 15 || Dec 15 2010 || 
|-
| 4426 ||  || [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Day of Defeat: Source]] || {{src09|1}} || Protocol Version 15 || Feb 21 2011, Dec 20 2010        (HL2:DM and DoD:S) || 
|-
| 4440 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Mar 4 2011 || 
|-
| 4539 ||  || [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{src09|1}} || Protocol Version 15 || Apr 12 2011 || 
|-
| 4554 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Apr 27 2011 || 
|-
| 4560 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || May 3 2011 || 
|-
| 4569 ||  || [[Day of Defeat: Source]], [[Counter-Strike: Source]] || {{src09|1}} or {{srcmp|1}} Beta? || Protocol Version 16 || May 12 2011 || 
|-
| 4574 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 16 || May 17 2011 || New protocol version for MP games. During this time, SDK is getting an update (which was released in October 2011) to distinguish MP games that use MP binaries as Source MP branch.
|-
| 4596 ||  || [[Team Fortress 2]] || {{src07|1}} || Protocol Version 14 || Jun 8 2011 || made specifically for viewing old demos? 2007 branch hasn't been updated since 2010
|-
| 4604 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 16 || Jun 15 2011 || 
|-
| 4608 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 17 || Jun 27 2011 || 
|-
| 4617 ||  || [[Garry's Mod]] (v12) || {{srcmp|1}} || Protocol Version 17 || Jun 30 2011 || 
|-
| 4624 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 17 || Jul 6 2011 || 
|-
| 4644 ||  || [[Half-Life 2: Deathmatch]], [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 17 || Jul 30 2011 || 
|-
| 4657 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10040 || Aug 8 2011 || 
|-
| 4667 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 17 || Aug 30 2011 || 
|-
| 4687 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 18 || Sep 14 2011 || 
|-
| 4706 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Sep 26 2011 || 
|-
| 4710 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Oct 6 2011 || 
|-
| 4716 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? ||  || 
|- id="4727"
| 4727 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 18 || Oct 19 2011 || [[Source_SDK_release_notes_archive#Source_SDK_(10/19/2011)|Source SDK Update]] - Multiplayer titles are now listed under the Source MP branch. Before this SDK update, games that use either {{code|source 2007 binaries 2.gcf}} or {{code|multiplayer ob binaries.gcf}} are simply referred to as using Source 2009 branch.
|-
| 4743 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 19 || Nov 2 2011 || 
|-
| 4769 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 21 || Nov 28 2011 || 
|-
| 4773 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10045 || Dec 2 2011 || 
|-
| 4785 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 21 || Dec 14 2011 || 
|-
| 4826 ||  || {{p3|1}} || {{src09|1}} || Protocol Version 15 || Jan 24 2012 || Latest version for Postal III (Steam, Zoom).
|-
| 4833 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 21 || Jan 31 2012 || 
|-
| 4871 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10058 || Mar 9 2012 || 
|-
| 4882 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10062 || Mar 20 2012 || 
|-
| 4885 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 21 || Mar 23 2012 || 
|-
| 4890 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10063 || Mar 28 2012 || 
|-
| 4890 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 10064 || Mar 30 2012 || 
|-
| 4909 ||  || [[Half-Life 2: Deathmatch]], [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 21 || Apr 16 2012 || 
|-
| 4904 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 11003 || Apr 11 2012 || 
|-
| 4910 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 11101 || Apr 17 2012 || 
|-
| 4920 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 11202 || Apr 27 2012 || 
|-
| 4924 ||  || [[Portal 2]], [[Counter-Strike: Global Offensive]] || {{p2branch|1}}</br>{{csgobranch|1}} (Beta) || Protocol Version 2001, Protocol Version 11307(CS:GO) || May 1 2012 || 
|-
| 4934 ||  || [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{srcmp|1}} || Protocol Version 21 || May 11 2012 || 
|-
| 4939 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} (Beta) || Protocol Version 11504 or Protocol Version 11511 || May 16 2012 || 
|-
| 4941 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || May 31 2012 || 
|-
| 4961 ||  || [[Day of Defeat: Source]], [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 21 || Jun 7 2012 || 
|-
| 4981 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 22 || Jun 27 2012 || 
|-
| 4993 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 22 || Jul 9 2012 || 
|-
| 5028 ||  || [[Counter-Strike: Source]], [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 22 || Aug 20 2012 || 
|-
| 5042 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Aug 27 2012 || 
|-
| 5051 ||  || [[Day of Defeat: Source]], [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 22 || Sep 5 2012 || 
|-
| 5072 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 22 || Sep 26 2012 || 
|-
| 5126 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 22 || Nov 19 2012 || 
|-
| 5198 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 23 || Jan 30 2013 || 
|-
| 5134 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Nov 27 2012 || 
|- id="5135"
| 5135 ||  || [[Half-Life 2]], [[Portal]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]] || {{src09|1}} || Protocol Version 15 || Nov 28 2012 || Last version before Steampipe.<br>Airboat stops on every map load.<br>Early Dark Energy glitch. Source Unpack (HL2 and [[Portal]])
|-
| 5153 ||  || [[Half-Life 2: Deathmatch]], [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 23 || Dec 16 2012 || 
|-
| 5163 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 12154 || Dec 26 2012 || 
|-
| 5191 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 23 || Jan 23 2013 || 
|-
| 5198 ||  || [[Counter-Strike: Source]] || {{srcmp|1}} || Protocol Version 23 || Jan 30 2013 || 
|-
| 5212 ||  || [[Team Fortress 2]] || {{srcmp|1}} || Protocol Version 23 || Feb 12 2013 || First Linux build
|- id="5243"
| 5243 ||  || [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{srcmp|1}} (DOD:S) </br>{{src13mp|1}} (Beta) || Protocol Version 16, Protocol Version 24 (CS:S and HL2:DM) || Mar 16 2013 || Early SteamPipe MP Beta.
|- id="5252"
| 5252 || 1717992 (HL2:DM) || [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]] || {{src13mp|1}} || Protocol Version 24 || Mar 25 2013 || First SteamPipe MP build.
|- id="5275"
| 5275 ||  || [[Team Fortress 2]] || {{src13mp|1}} || Protocol Version 24 || Apr 17 2013 || TF2 SteamPipe beta.
|- id="5288"
| 5288 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]] || {{src13sp|1}} || Protocol Version 24 || May 7 2013 || First SteamPipe SP build. [https://store.steampowered.com/news/app/220/view/2900836612635109191 Beta release]. Replaced [[GCF]] with [[VPK]].
|-
| 5304 ||  || [[Counter-Strike: Source]] || {{src13mp|1}} || Protocol Version 24 || May 20 2013 || 
|-
| 5308 ||  || [[Counter-Strike: Source]] || {{src13mp|1}} || Protocol Version 24 || May 20 2013 || 
|-
| 5318 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || May 30 2013 || 
|-
| 5336 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]] || {{src13sp|1}} || Protocol Version 24 || Jun 17 2013 || 
|-
| 5337 ||  || [[Day of Defeat: Source]], [[Counter-Strike: Source]] || {{src13mp|1}} || Protocol Version 24 || Jun 18 2013 || 
|-
| 5339 ||  || [[Portal]] || {{src13sp|1}} || Protocol Version 24 || Jun 20 2013 || 
|- id="5345"
| 5345 || 1745010 || [[Half-Life: Source]], [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Team Fortress 2]], [[Half-Life 2: Deathmatch]] || {{src13sp|1}}</br>{{src13mp|1}} || Protocol Version 24 || Jun 26 2013 || SteamPipe SP [https://store.steampowered.com/news/app/220/view/2900836612635108465 public release].
|-
| 5353 ||  || [[Half-Life 2: Deathmatch]] || {{src13mp|1}} || Protocol Version 24 || Jul 4 2013 || 
|-
| 5365 ||  || [[Half-Life 2]] || {{src13sp|1}} || Protocol Version 24 || Jul 16 2013 || 
|-
| 5434 ||  || [[Half-Life 2: Episode One]] || {{src13sp|1}} || Protocol Version 24 || Sep 23 2013 || 
|-
| 5436 ||  || [[Half-Life 2]] || {{src13sp|1}} || Protocol Version 24 || Sep 25 2013 || 
|-
| 5454 ||  || [[The Stanley Parable]] || {{p2branch|1}} || Protocol Version 1000 || Oct 13 2013 || 
|-
| 5476 ||  || [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Nov 4 2013 || 
|-
| 5543 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13200 || Jan 10 2014 || 
|-
| 5563 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13210 || Jan 31 2014 || 
|-
| 5574 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13220 || Feb 11 2014 || 
|-
| 5595 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13250 || Mar 5 2014 || 
|-
| 5630 || v1.0.10.1 (game)</br>2.0.0.1 (server) || [[Titanfall]], [[Source Dedicated Server|Titanfall Dedicated Server]] || {{tfbranch|1}} || Protocol Version 2001 || Apr 7 2014 || Dedicated Server, unofficially using [https://github.com/r1delta/r1delta R1Delta]. Version can be only seen when using Dedicated Server shipped with R1Delta.
|-
| 5645 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13270 || Apr 23 2014 || 
|- id="5668"
| 5668 || 2229597</br><small>(sourcetest)</small> || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]],[[Source SDK Base 2013 Singleplayer]] || {{src13sp|1}} || Protocol Version 24 || May 15 2014 || Latest version of SDK Base 2013 Singleplayer (non-upcoming). Formerly latest public build for Half-Life 2 (including Episodes), and Half-Life: Source until 2019.
|-
| 5682 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || May 29 2014 || 
|- id="5668"
| 5687 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Jun 2 2014 || 
|-
| 5711 ||  || [[Half-Life 2: Episode Two]] || {{src13sp|1}} || Protocol Version 24 || Jun 27 2014 || 
|-
| 5723 ||  || [[Portal Stories: Mel]] || {{p2branch|1}} || Protocol Version 2001 || Jul 9 2014 || 
|-
| 5805 || 2422905</br><small>(sourcetest)</small> || [[Half-Life 2]], [[Half-Life 2: Update]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]], [[Source SDK Base 2013 Singleplayer]] || {{src13sp|1}} || Protocol Version 24 || Sep 29 2014 || SDK Base 2013 Singleplayer ({{code|upcoming}} beta branch). Half-Life 2: Update also runs on this version, without marking it as a beta engine version (and then never get updated again). Beta branch version for Half-Life 2 (including Episodes), Half-Life: Source until 2019.
|-
| 5875 ||  || [[Portal]] || {{src13sp|1}} || Protocol Version 24 || Dec 8 2014 || 
|-
| 5916 ||  || [[Insurgency]] || {{csgobranch|1}} || Protocol Version 1606 || Jan 18 2015 || 
|-
| 5917 ||  || [[Insurgency]] || {{csgobranch|1}} || Protocol Version 1609 || Jan 19 2015 || 
|-
| 5921 ||  || [[Insurgency]] || {{csgobranch|1}} || Protocol Version 1611 || Jan 23 2015 || 
|-
| 5931 ||  || [[Insurgency]] || {{csgobranch|1}} || Protocol Version 1615 || Feb 2 2015 || 
|-
| 5970 || v1.0.10.1 || [[Titanfall]] || {{tfbranch|1}} || Protocol Version 2001 || Mar 13 2015 || Latest version. Protocol version same as Portal 2, and can be only seen using [https://github.com/r1delta/r1delta R1Delta] Dedicated Server.
|-
| 6031 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13483 || May 13 2015 || 
|-
| 6186 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Oct 15 2015 || 
|-
| 6300 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Feb 6 2016 || 
|-
| 6373 ||  || [[Garry's Mod]] || {{src13|1}} (custom) || Protocol Version 24 || Apr 19 2016 || 
|-
| 6396 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || May 12 2016 || 
|-
| 6403 ||  || [[Left 4 Dead 2]] || {{l4dbranch|1}} || Network Version 2.0.4.2 || May 19 2016 || 
|-
| 6579 ||  || [[Garry's Mod]] || {{src13|1}} (custom) || Protocol Version 24 || Nov 11 2016 || 
|-
| 6796 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Jun 16 2017 || 
|-
| 6800 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Jun 20 2017 || 
|-
| 6803 || v2.0.6.1 || [[Titanfall 2]] || {{tfbranch|1}} || Protocol Version 2001 || Jun 23 2017 || 
|-
| 6830 ||  || [[Left 4 Dead]] || {{l4dbranch|1}} ||                                          ? || Jul 16 2019 || 
|-
| 7199 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Jul 24 2018 || 
|-
| 7227 ||  || [[Left 4 Dead 2]] || {{l4dbranch|1}} || Network Version 2.0.4.2 || Jul 16 2019 || 
|-
| 7412 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Feb 22 2019 || 
|-
| 7471 ||  || [[Portal]] || {{src07|1}} || Protocol Version 14 || Apr 22 2019 || Leaked Source Code
|-
| 7621 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13723 || Sep 19 2019 || 
|- id="7628"
| 7628 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Sep 26 2019 || Last version of Source 2013 SP which support Windows XP. Also last version of Half-Life 2 (including Episodes) and Half-Life: Source before Steam Deck update. This version of Half-Life 2 fixes NPCs eye blinking issues. Released 5 years after the last update in June 2, 2014.</br>To downgrade, use the following Steam console command:{{ExpandBox|title=Downgrade September 26, 2019 build|{{Note|You must own the game on Steam to download older versions of these games. For Half-Life 2, if you don't own the game, you will instead get the demo version. Files will be downloaded to {{path|Steam\steamapps\content}} folder. {{Steam|nav/console|Click here to open Steam Console}}.}}</br>Half-Life 2 Base: {{code|download_depot 220 221 3496606386859468894}}</br>Half-Life 2 Windows binaries: {{code|download_depot 220 222 8161907925122915749}}</br>Half-Life 2 Mac (32-bit only) binaries: {{code|download_depot 220 222 7064073969673431741}}</br>Half-Life 2 Linux binaries: {{code|download_depot 220 224 4015521282705015687}}</br>Episode One base: {{code|download_depot 380 380 829566834853997203}}</br>Episode One binaries: {{code|download_depot 380 389 3450911747977758554}}</br>Episode Two: {{code|download_depot 420 420 4642404712283709031}}</br>HL: Source :{{code|download_depot 280 280 8137697684063612960}}}}
|-
| 7641 ||  || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Oct 9 2019 || 
|-
| 7803 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13746 || Mar 19 2020 || 
|-
| 7891 ||  || [[Garry's Mod]] || {{src13|1}} (custom) || Protocol Version 24 || Aug 7 2020 || 
|-
| 7834 ||  || [[Black Mesa]] || {{xengine|1}} || Protocol Version 24 || Aug 19 2020 || 
|-
| 7899 ||  || [[Portal]] || {{src13sp|1}} || Protocol Version 24 || Jun 23 2020 || 
|-
| 7915 ||  || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Jul 9 2020 || 
|-
| 7929 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13762 || Jul 29 2020 || 
|-
| 7929 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13764 || Aug 17 2020 || 
|-
| 7935 || 7.1.0.9 || [[Alien Swarm]] || {{asbranch|1}} || Protocol Version 7109 || Jul 29 2020 || Latest version for Alien Swarm.
|-
| 7964 ||  || [[Team Fortress 2]] || {{p2branch|1}} || Protocol Version 24 || Aug 27 2020 || 
|-
| 7970 || 2.2.0.0 || [[Left 4 Dead 2]] || {{l4dbranch|1}} || Network Version 2.1.0.0 || Sep 15 2020 || {{l4d2|1}} - [https://left4dead.fandom.com/wiki/The_Last_Stand_Community_Update The Last Stand Community Update]
|-
| 7929 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13768 || Sep 16 2020 || 
|-
| 8007 ||  || [[Team Fortress 2]] || {{src13mp|1}} || Protocol Version 24 || Oct 9 2020 || 
|-
| 8011 ||  || [[Left 4 Dead 2]] || {{l4dbranch|1}} || Network Version 2.1.0.0 || Oct 20 2020 || 
|-
| 8012 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13776 || Jan 7 2021 || 
|-
| 8012 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13780 || Jun 26 2021 || 
|-
| 8012 ||  || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13786 || Mar 22 2021 || 
|-
| 8049 ||  || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life 2: Lost Coast]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Nov 20 2020 || 
|-
| 8098 ||  || [[Team Fortress 2]] || {{src13mp|1}} || Protocol Version 24 || Jan 8 2021 || 
|-
| 8151 ||  || [[Team Fortress 2]] || {{src13mp|1}} || Protocol Version 24 || Mar 2 2021 || 
|- id="8273"
| 8273 || 6630498 || [[Half-Life Deathmatch: Source]], [[Day of Defeat: Source]], [[Counter-Strike: Source]], [[Half-Life 2: Deathmatch]], [[Source SDK Base 2013 Multiplayer]] || {{src13mp|1}} || Protocol Version 24 || Jul 2 2021 || Last version of {{src13mp|1}}, aswell as last version of Source 2013 to support Windows XP (future version of Source 2013 SP and TF2 branch (successor to Source 2013 MP), only support Windows Vista and 7 or later respectively). All games from this branch, including SDK Base are moved to {{tf2branch|1}} in 2025.{{ExpandBox|title=Downgrade July 2, 2021 build|To get older versions of those games, prior to {{tf2branch|1}} update, simply select {{code|previous_build}} (not available on {{tf2|1}}), or {{code|previous2021}} (for SDK 2013 MP).</br>Otherwise go to {{steamdb}}, search for the game, go to depots (select (game name) Depots and (your OS) client), go to manifest, and download older version of the game dated 2 July 2021 using Steam console ({{Steam|nav/console|click to open}}) or DepotDownloader. Files will be downloaded to {{Code|Steam\steamapps\content}} folder.}}
|- id="8497"
| 8497 || 7087047 || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]] || {{src13sp|1}} || Protocol Version 24 || Feb 8 2022 || Steam Deck update, released Feb 16, 2022.
|- id="8497"
| 8776 || 8491853 <small>(HL2, Nov 2023)</small></br>1745010 <small>(Portal - Patch/Client)</small></br>8614805 <small>(Portal - Server, Jan 2024)</small> || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]], [[Portal]] || {{src13sp|1}} || Protocol Version 24 || Nov 17 2022 || Last version of Half-Life 2 prior to 20th Anniversary Update. Released November 19, 2022, and subsequently updated in January 18, 2023 and November 17, 2023. Also the last version of Portal before it was upgraded to Half-Life 2 20th Anniversary version of Source 2013 SP. {{ExpandBox|title=Downgrade to pre-Anniversary build (HL2 & HL:S)|To get the pre-20th Anniversary version of Half-Life 2 and Half-Life: Source, simply select {{code|steam_legacy}} on Half-Life 2 (note that you don't need to select any beta branches on Half-Life: Source, as HL:S files (last updated Sep 2019) are built for pre-Anniversary version of HL2 engine).</br>Alternatively, you can go to {{steamdb}}, [https://steamdb.info/app/220/depots/ click here] to view Half-Life 2 depot on {{steamdb}} then click on Half-Life 2 Base and (your OS) client, go to manifest, and download older version of the game dated 14 November 2023 by copying manifest ID via 📋 button and using Steam console ({{Steam|nav/console|click to open}}) or DepotDownloader. Files will be downloaded to {{Code|Steam\steamapps\content}} folder.}}</br>{{ExpandBox|title=Downgrade to pre-Anniversary build (Portal)|To get older version of Portal before it was upgraded to Half-Life 2 20th Anniversary engine, [https://steamdb.info/app/400/depots/ click here] to view Portal depot on {{steamdb}}, click on Portal and (your OS) client, go to manifest, and download older version of the game dated 5 January 2024 by copying manifest ID via 📋 button and using Steam console ({{Steam|nav/console|click to open}}) or DepotDownloader. Files will be downloaded to {{Code|Steam\steamapps\content}} folder.}}
|- id="8802"
| 8802 || 1.38.8.1</br>1575 <small>(client/server)</small></br>8413246 <small>(SourceRevision)</small> || [[Counter-Strike: Global Offensive]] || {{csgobranch|1}} || Protocol Version 13881 || Aug 24 2023 || Last CS:GO version (csgo_legacy) beta branch
|-
| 8928 || 2.0.0.1 || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Feb 2 2024 || 
|-
| 9474 || 2023.06.28 || [[Garry's Mod]] (x86-64) || {{src13|1}} (custom) || Protocol Version 24 || Oct 15 2024 || GMod version 2024.10.16
|- id="9477"
| 9477 || 1.0.4.4 (L4D)</br>2.2.4.3 (L4D2) || [[Left 4 Dead]], [[Left 4 Dead 2]] || {{l4dbranch|1}} || Protocol Version 1044 (L4D)</br>Network Version 2.1.0.0 (L4D2) || Oct 18 2024 (L4D, L4D2)</br>Jan 16 2025 (L4D2, Update) || Originally released in October 24/25, 2024. Updated in December 2, 2024 ([https://steamdb.info/patchnotes/16172641/ L4D], [https://steamdb.info/patchnotes/16546363/ L4D2]) and January 16, 2025 ([https://steamdb.info/patchnotes/17033350/ L4D], [https://steamdb.info/patchnotes/17255556/ L4D2]) to fix another exploit in both games.</br>Latest version for {{l4d|1}} and {{l4d2|1}}.
|- id="9505"
| 9505 || 9333546 || [[Half-Life 2: Deathmatch]] || {{tf2branch|1}} || Protocol Version 24 || Nov 15 2024 || [[Half-Life 2: Deathmatch]] 20th Anniversary Update (upgraded {{src13mp|1}} > {{tf2branch|1}})
|- id="9505-2"
| 9505 || 9350367 || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]] || {{src13sp|1}} (Anniversary) || Protocol Version 24 || Nov 15 2024 || [[Half-Life 2]] 20th Anniversary Update
|- id="9515"
| 9515 || 9525199 || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]] || {{src13sp|1}} (Anniversary) || Protocol Version 24 || Nov 25 2024 || Beta version, which would become Feb 11, 2025 build.
|-
| 9515 || 9526483 || [[Half-Life 2]], [[Half-Life 2: Episode One]], [[Half-Life 2: Episode Two]], [[Half-Life: Source]] || {{src13sp|1}} (Anniversary) || Protocol Version 24 || Nov 25 2024 || Latest version for HL2, HL:S. Released Feb 11, 2025.
|- id="9515-portal"
| 9515 || 1745010 <small>(Patch/Client)</small></br>9530103 <small>(Server)</small>|| [[Portal]] || {{src13sp|1}} (Anniversary) || Protocol Version 24 || Nov 25 2024 || Portal running on {{hl2|1}}'s 20th Anniversary Update engine (Feb 13, 2025 update). This version was quickly pulled off Steam due to a bug (missing fire particles) that crashes the game when trying to play the last map ({{code|escape_02.bsp}}), as well as the misaligned Portal logo on the menu.
|-
| 9515 || 1745010 <small>(Patch/Client)</small></br>9776088 <small>(Server, May 24)</small></br>9786830 <small>(Server, May 28)</small>|| [[Portal]] || {{src13sp|1}} (Anniversary) || Protocol Version 24 || Nov 25 2024 || Fixed version of Portal Feb 13, 2025 update, [https://store.steampowered.com/news/app/400/view/645814564414293180 released] in May 20, 2025. Also subsequently updated again with new bug fixes in [https://store.steampowered.com/news/app/400/view/520840214227191016 May 24] and [https://store.steampowered.com/news/app/400/view/520840848816997084 May 28].
|-
| 9516 || 9371887 || [[Half-Life 2: Deathmatch]] || {{tf2branch|1}} || Protocol Version 24 || Nov 26 2024 || 
|-
| 9537 || 9433646 || [[Team Fortress 2]] || {{tf2branch|1}} || Protocol Version 24 || Dec 17 2024 || 
|-
| 9568 || 2.0.0.1 || [[Portal 2]] || {{p2branch|1}} || Protocol Version 2001 || Jan 17 2025 || Latest version for [[Portal 2]] (Windows).
|- id="9598"
| 9598 || 9540945 <small>(HL2:DM, CS:S)</small></br>9546320 <small>(SDK)</small> || [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life 2: Deathmatch]], [[Half-Life Deathmatch: Source]], [[Team Fortress 2]], [[Source SDK Base 2013 Multiplayer]] || {{tf2branch|1}} || Protocol Version 24 || Feb 16 2025 || February 18, 2025 update. SDK for TF2 branch was released. All {{src13mp|1}} games (except third-party) upgraded to this branch. 64-bit support (Windows & Linux).
|- id="9683"
| 9683 || 9743042 <small>(SDK)</small> || [[Counter-Strike: Source]], [[Day of Defeat: Source]], [[Half-Life 2: Deathmatch]], [[Half-Life Deathmatch: Source]], [[Team Fortress 2]], [[Source SDK Base 2013 Multiplayer]] || {{tf2branch|1}} || Protocol Version 24 || May 12 2025 || Upcoming beta version for other {{tf2branch|1}} games (released May 13, 2025). Released for Team Fortress 2.
|- id="9684"
| 9684 || 9742990 <small>(TF2)</small> || [[Team Fortress 2]] || {{tf2branch|1}} || Protocol Version 24 || May 13 2025 <small>(TF2)</small> || Latest version for Team Fortress 2 (May 13, 2025).
|}

== External links ==
* [https://docs.google.com/spreadsheets/d/1ldzhd6vxd-03le5ymesUeG-hLWmxLpH79ajayeYDUNs Valve Engine Build List - Google Docs]
** Originally written by ExtraVirus (SourceRuns), and added to VDC with new info.
* [https://archive.org/details/steam2chunks Steam2 Chunks archive (2005-2009)]
** Many older versions of the game (pre-SteamPipe) can be found here. These games obviously requires Steam to boot, and some games may not work out of the box. Some builds and binaries (including all Source 2009 binaries, labeled as Source 2007 binaries 2) are still missing on the archive through.
* {{Steamdb}}
** SteamDB can be used to find older versions of the game (starting from 2013 ([[SteamPipe]]) to present). To download older versions, user can use Steam [[Developer Console]] or [https://github.com/SteamRE/DepotDownloader DepotDownloader]. Files will be downloaded to {{Code|Steam\steamapps\content}} folder. Most Source engine games (since 2013) are DRM-free but downloading older versions via this method '''requires''' you to own the game (if the game was paid).

[[Category:Lists]] [[Category:Changelists]] {{Source topicon}}