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.
Uploaded15.04.2026 16:56
VersionLatest
Size820.12 MB
Views72
Downloads0
Localizations:
Localizations:
The mod is localized into 1 language
(You don’t need to download anything extra to play in these languages)
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