Source SDK Base 2013

Source SDK Base 2013 is a game/tool available to all Steam users which, as the name suggest, is locked to Source 2013 engine branch, to prevent incompatible engine updates from making your mod unusable.

SDK Base versions

There are two versions of Source SDK Base(s) 2013:

• Source SDK Base 2013 - Multiplayer (AppID: 243750 - Click to Install)
  • Note:This branch originally runs on Source 2013 Multiplayer, but it has been upgraded to Team Fortress 2 branch, which might be incompatible with mods built on legacy version of Source 2013 Multiplayer (that runs on Source 2013 Multiplayer).

To downgrade to legacy version of Source SDK Base 2013 Multiplayer, follow the instructions:

1. Open Steam, go to Source SDK 2013 Multiplayer, right click Properties

2. A window will open. Go to "Betas", select previous2021 beta branch.

3. Steam will automatically re-download the files. Once it's done, run Source SDK Base 2013 MP as normal, or use it's tools.

• Source SDK Base 2013 - Singleplayer (AppID: 243730 - Click to Install)

Compiling code

To set up Source SDK 2013 and compiling the game, see:

• Setting up Source SDK Base 2013 Multiplayer (TF2 branch)
• Setting up Source SDK Base 2013 Singleplayer