Source Engine Beta

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We are enabling a new Source Engine Beta system. This will allow you to run Source games with the latest beta version of the engine. You can use this feature to ensure mods will be compatible with a soon to be released version of the Source engine and report any bugs or compatibility issues before they are released to a wide audience.

Warning: This engine is currently in a testing phase. Running this beta version may cause problems running Source games under Steam. If this is the case, please consider submitting a bug report, describing the problem and its repro steps and your system configuration. You can also disable the Source engine beta by following the instructions in the Switching back to the non-beta engine section below.

Current Status

This beta is currently in progress. The latest updates can be found below.

Latest updates

Thursday May 11th, 2006

Initial release. Further updates will link to a Source Engine Beta Changelist entry.

Getting the Source Engine Beta

Modifying a Steam shortcut to launch the Source Engine Beta

Install instructions.

To run this beta version you will need to add -beta engine to your command line when you start Steam. This can be done by opening up the Windows shortcut you use to launch Steam and adding -beta engine right after Steam.exe. Please report any bugs or issue you find in this article.

Important: You should also disable Steam from running automatically when Windows starts, to prevent it from running the non-beta Source Engine. To disable Steam from running automatically:

  1. Open the Steam window.
  2. Choose Settings from the File menu.
  3. Click on the Interface tab.
  4. Uncheck the Run Steam when Windows starts option.

Current changelist

For the latest changes and additions, see:

Known issues

Read about the current Known Issues with the Source Engine Beta on this page.

Bug reporting

To report any issues you find with the Source Engine Beta (and not the regular standard engine and games releases), visit these articles:

Switching back to the non-beta engine

You can revert to the "non-beta" standard Source Engine release by following these steps:

  1. Exit Steam if it's currently running by right-clicking on the Steam tray icon and choosing Exit.
  2. Open the Windows shortcut you use to launch Steam and remove -beta engine.
  3. Launch Steam from the shortcut.
  4. Re-enable Run Steam when Windows starts option if desired.

See also

  • Related links, when applicable.