Gamma Energy visits the Aperture Science East facility, built after GLaDOS gained sentience. The goal was to create a facility where GLaDOS' research could be examined and tested without harm to employees or other people who actually... mattered, without her knowledge. Pick up a prototype Portal Device and try not to die.
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Valve still doesn't really support Steam on OSX, no matter how much they've said otherwise. This hack fixes it.
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Didn't work for me. Portal opened and closed half a second later.
the install worked, but the moment I tried to play Portal, it said "update failed (missing executable)" and trying to play it again, it appears to be completely re-installing Portal
once it finished reinstalling, I tried to open it again, and it *sorta* worked, it loaded up to the main menu, but then said that no such map existed whenever I tried to load a map,