About this File:

ortal: 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 and repetitive. This is why they decided to build a great artificial intelligence that could both replace them in these difficult tasks, but also take responsibility for many other tasks within the complex and compete with Black Mesa's superiority. All employees of the Aperture Science complex are now eagerly awaiting GlaDOS. Maybe even a little too eagerly, as the upcoming events will tell...

Top Link: GameStand | Link Rating: 5 (see 1 link)

About this File:

Based on Portal: The Flash Version, Hen Mazolski brings us all the levels and concepts back to the original Portal version, in this huge mappack! This time, experience Aperture Science from a different perspective, before the time of the original Portal, as a different test subject. This mappack includes ALL 40 levels from WCS's Flash version, additional bonus levels and features. All together, we've got here over three and a half hours of amazing gameplay.

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About this File:

DESCRIPTION: This mod uses simple Source console commands and binds to create a Bullet-Time-ish Mod. Computer too slow to pass those triple-Portal Jumps? Wish you could finish the chambers faster? If installed correctly, just press "V" in game to activate/deactivate "Slow-Mo". There are two versions in this release, one for those who like a little more visual queue. The Bloomless version does not alter any visuals in the game, so if the Bloom version seems too bright, you can use the Bloomless.

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About this File:

This is a great map. Download it takes a new look at the energy ball and the button usage.

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About this File:

New map for Portal - Glasschamber v2

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About this File:

New map for portal, called Chamber 21.

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