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SDK Versions

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Source The Source SDK is the set of programs that allow you to create mods, maps, and just generally "develop" using Source.

The Source SDK Base is the set of required files to play any mods created using the Source SDK. For example, if you only want to play Source mods, you'll only need the Source SDK Base. But if you also want to develop mods and maps, you'll need both the Source SDK and the Source SDK Base.

The Source SDK Base 2007 (also known as "Source SDK Base - Orange Box") is the set of required files to develop and play in mods using the Orange Box version of the Source Engine.

Since Valve released the Left 4 Dead Authoring Tools instead of updating the Source SDK for use with Left 4 Dead Left 4 Dead, there is no "Source SDK Base - Left 4 Dead." Unlike the Source SDK (2006, 2007 and 2013), the Left 4 Dead Authoring Tools are only for creating maps and some contents for Left 4 Dead, which has all the files required to play the maps (hence the lack of Source SDK Base - Left 4 Dead). This is also true for Alien Swarm Alien Swarm, Portal 2 Portal 2, and Counter-Strike: Global Offensive Counter-Strike: Global Offensive. Authoring Tools for these games usually didn't include the source code for these games (except Alien Swarm).

In 2013, Valve released Source SDK 2013. This doesn't work with the previously-mentioned games (like SDK 2007 and older), but it comes with new Source 2013 Source 2013 features like Linux support, 🖿custom folder for much easier custom contents installation. Additionally, all Valve games on earlier branches were updated to Source 2013 Singleplayer Source 2013 Singleplayer or Source 2013 Multiplayer Source 2013 Multiplayer, as appropriate, so Source SDK 2013 has improved compatibility with current versions of those games.