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.

Gamma Energy Mac Install Script
Location
Games : Portal : Mods : Gamma Energy : Files
Filename
geinstall.rb.zip
Category
Patch
Uploader
Gamma_Energy
Added
Size
1.2kb (1,230 bytes)
Downloads
449 (2 today)
MD5 Hash
9b993a9c1033d479bdbff8f3c90c0f77
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Description

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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Gamma Energy Mac Install Script
Comments
support1358549406
support1358549406

Didn't work for me. Portal opened and closed half a second later.

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asw01
asw01

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,

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Portal
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Portal
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Gamma_Energy
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