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.
An awesome mod. But why aren't there any walk-through videos for the advanced chambers? After 2 months, I've finally finished the advanced "Uninsulated Electrical Parts," but there are still ones I'm completely stuck on. Very cool mod.