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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Can't switch weapons in HL2 maps imported into Portal

After seeing Half-Life 2 being played with the Portal Gun by importing the maps into Portal's map folder, I wanted to do it myself. I got the maps to work properly, but when I use "impulse 101" to get ...