Portal is a single-player puzzle-platformer developed by Valve Corporation.

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Portal: The First Slice Demo Glitch

I thought of trying out the demo of Portal before I bought the game and was amazed. But then after chamber 10 something weird happened that wouldn't allow me to continue to chamber 11. I wasn't sure ...
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How Can I Reproduce GLaDOS' Voice Modulation Effect? [closed]

One of things I'm particularly interested is how they transformed Ellen McLain's voice to GLaDOS' musical one. I don't think it's entirely a natural effect by voice acting, though I have to admit I ...
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Easter Eggs in Portal/Portal 2 [closed]

Since Valve makes numerous games that are quite popular, I was wondering if anyone had a good resource for listing the Easter Eggs in Portal and Portal 2. I've seen some web pages that list a couple, ...
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Bad rendering in Portal Linux beta

I get a strange rendering problem in Portal on Linux (via the latest Steam beta). I'm running on integrated Intel HD4000 with fairly recent modules/drivers (up to date Arch). Everything is smooth and ...