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Portal Effect from Teaser TrailerIn Portal Single Player · 16 years ago

[RELEASE] Remmiz Test Chamber 3In Community Releases · 16 years ago

Strange reflectIn Hammer and Modding · 16 years ago

freaky!!!In Portal Single Player · 16 years ago

[RELEASE] pl_Toast - The massively belated release thread!In Community Releases · 17 years ago

[RELEASE] OrientationIn Community Releases · 17 years ago

[RELEASE] PuzzleOneIn Community Releases · 16 years ago

[RELEASE] ShmitzchamberIn Community Releases · 17 years ago

Logic Portals : GLaMS-DOS game files lost in a system crashIn Hammer and Modding · 16 years ago

[RELEASE]Portal | Underground StoryIn Hammer and Modding · 16 years ago

[RELEASE] AgitoIn Community Releases · 16 years ago

[RELEASE] Maybe Black MesaIn Community Releases · 17 years ago

[RELEASE] A Change of PlansIn Community Releases · 16 years ago

VTFPhotoshop issuesIn General Off Topic Discussion · 16 years ago

[WIP] Geekofalltrades' Portal MapIn Hammer and Modding · 16 years ago

Sigh, ads yet again (or, Donations always welcome)In General Off Topic Discussion · 17 years ago

Turn off HUDIn General Off Topic Discussion · 16 years ago

lolIn General Off Topic Discussion · 16 years ago

What happened to project betA?In Portal Single Player · 16 years ago

[WIP] The Seven Room Banazza NOW version 1.2In Hammer and Modding · 16 years ago

[WIP] LabrynthIn Hammer and Modding · 16 years ago

My next mapIn Hammer and Modding · 16 years ago

Companion Cube mapsIn Hammer and Modding · 16 years ago

[WIP] The Omega ProjectIn Hammer and Modding · 17 years ago

Map TroubleshootingIn Hammer and Modding · 16 years ago

[WIP] Raven HallIn Hammer and Modding · 16 years ago

button and portalIn Hammer and Modding · 16 years ago

Moving grid?In Hammer and Modding · 16 years ago

New Spotlight and Other NewsIn News and Announcements · 16 years ago

Idea: Portal MultiplayerIn Portal Single Player · 17 years ago

Stargate TC² needs you !In General Off Topic Discussion · 16 years ago

Aperture Science Heavy FighterIn General Off Topic Discussion · 16 years ago

Max Map Size?In Hammer and Modding · 16 years ago

[RELEASE]s-Test6In Hammer and Modding · 16 years ago

[RERELEASE]PortIllogic - Episode: PreIn Hammer and Modding · 16 years ago

Dynamic Lighting in SourceIn General Off Topic Discussion · 16 years ago

Texture lighting func_brushesIn Hammer and Modding · 16 years ago

Portal Chambers under WaterIn Hammer and Modding · 16 years ago

My PC is going though powerpacks rather too quickly..In General Off Topic Discussion · 16 years ago

Mod idea...In General Off Topic Discussion · 16 years ago

Help: Suggestions for Jump Booster PadIn Hammer and Modding · 16 years ago

Portal: Combat TrainingIn Hammer and Modding · 16 years ago

[WIP] Infomercial mapIn Hammer and Modding · 17 years ago

[Release] Tasty Treats: Chamber 01In Community Releases · 16 years ago

my achievements got reset 🙁In Portal Single Player · 16 years ago

NVIDIA PhysX Particle Fluid DemoIn General Off Topic Discussion · 16 years ago

[RELEASE] reepblue's Bonus Challange Map 1In Community Releases · 16 years ago

Custom Vehicles in SDKIn Hammer and Modding · 16 years ago

Toronto ExplosionIn General Off Topic Discussion · 16 years ago

Thinking with Magnets.In Hammer and Modding · 16 years ago