Underground Story
PuzzlePortal | Underground story This Portal story is based on the MTN Portal Story | Part One! This mappack includes around 75 levels. in this mappack have...
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Portal 2 Mappack (it's for portal 1)
PuzzlePortal 2 Mappack is just a mappack for the original game Portal. This will just have 4 different chambers, it's not a huge mappack. This is just for fun...
Aperture
PuzzleThe story is rewritten in the fashion of a community project. Aperture features 19 test chambers and an escape sequence.
Portal Floccinauci
PuzzleThis mod will have a custom story, 20 new test chambers (all sticking to Portal's original design), and new testing elements.
Portal: New Adventure
PuzzlePortal: New Adventure is a small mod for game Portal. It takes you to the Aperture Science Growing up center. Just few chambers in old style, don't expect...
Portal: Still Alive - Map Pack version
PuzzlePortal: Still Alive, but instead of it being a mod on your Steam library, it's a map pack you can find in Bonus Maps.
Portal: Insane Aperture
PuzzleWhen Aperture Science sells its Database Division, its managers use their last moments of power to plan a sabotage of GLaDOS.
Portal: Prelude
PuzzlePortal: Prelude, as its name implies, is an unofficial prequel to the game Portal. Its story revolves around the pre-GlaDOS epoch way before she was plugged...
Portal: Exercise Caution
PuzzleIntroducing Exercise Caution, a mod which explains the events after GLaDOS' destruction by the hands of Chell. In this mod, you play as Robert Knoll...
Rexaura
PuzzleRexaura is a mod for Portal based on high energy pellets and several new mechanics surrounding them.