Portal Prelude

Portal Prelude is a modification for "Portal" video game. It was created on Source engine. It was developed by Portal: Prelude Team and was made available on October 8, 2008. Portal: Prelude, as its name states it, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch, even before she was plugged in. At this time, test subjects were monitored by real Aperture Science employees whose work was tedious, lengthy ... More

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