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

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Portal - Look Up and Look Down commands are not working

I am attempting to control the camera with the arrow keys in Portal 1. I bound the arrow keys to the 'Turn Left and Right' and 'Look up and down' commands in Settings, but when I tried to play, I ...
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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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cl_first_person_uses_world_model crashes game

I heard that you could enable the Source Engine's VR mode without an Oculus Rift using this command: cl_first_person_uses_world_model 1 Excited, I wanted to try it. I went to the first level, and ...