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

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Are these Portal challenges impossible?

I am playing Portal: Still Alive on XBox 360. In the challenge maps, there are advanced levels for chambers 13-18 named like "14: Advanced" and just like the standard chambers, they have medal ...
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Disabling the Radio in Portal

I bought Portal via Steam -- at some point they released an update that added a small radio to each level playing a muzak version of the Still Alive song. Googling indicates this is part of an easter ...