Portal: Prelude
Mod for Portal (2007) | Category: Custom Campaign
Author: Portal: Prelude Team | Curator: 
Modbadger
Mod for Portal (2007) | Category: Custom Campaign
Author: Portal: Prelude Team | Curator: Modbadger
Portal: Prelude is an unofficial prequel to Portal, depicting events before the activation of GLaDOS at Aperture Science, back when testing was conducted by human staff. It features 19 test chambers and additional trials that reveal the complex's backstory and the launch of GLaDOS.
Localizations:
The mod is localized into 1 language
(You don’t need to download anything extra to play in these languages)
Move the "portal prelude" folder to "C:\Program Files (x86)\Steam\steamapps\sourcemods" (or the folder where your Steam library is located). If the "sourcemods" folder is missing, simply create it.
Restart Steam.The mod should appear in your library.
Enjoy!
