Atlas and P-Body got out of the Upgrade Chamber, looked at each other, than themselves, and gave each other high-fives.
They had each gotten a Plexiglas eye, Chrome plating, reinforced Steel arms and legs, large power cells and entirely outfitted their wires with power saving, fast travelling and insulated wires, an Antenna Topper Flag and even tiny Radio's fitted into their heads, quickly used to play Smooth Jazz and Opera, respectively.
Atlas smashed a dirty glass screen and they used their Portal Guns to get to the balcony on the far side of the huge Robot-building room. They walked along the balcony, and walked through a large electronic door that was struggling to close after plants and vines jammed its controls. P-Body plucked a potato off part of the plant and rolled it along, before taking cover and peeking from behind the wall to see if it had exploded. When it did not, she stepped on it. They continued into a Test Chamber, where there were several acid filled trenches, and the hollow husks of turrets that had long since been killed.
Atlas looked at the wall, where a diagram showed a group of twelve Humans forming a bridge across the trenches, a Turret firing and a Toxic Symbol. Atlas fired his gun twice to get across the trenches, and P-Body followed.
"No unauthorized equipment. Unauthorized equipment leads to a loss of the $60 we previously mentioned, as well as the cake. Grief Counselling will still be available, though." A Male voice said from a speaker. "If you are desperately trying to escape Neurotoxin, please report to the current head of the Human Relations department. If he or she is either A) Dead, or B) trying to escape with you, just step into the toxin and take a deep breath and count backwards."
They walked to the end of the test, where an Aperture Science Material Emancipation Grid was stationed. P-Body walked through it, but as her foot touched it, the tip of it burned up and sizzled into nothingness. P-Body jumped back, and Atlas looked at the Grid, before kicking the steel surrounding it repeatedly until the grid stalled, and Atlas cautiously prodded the air where the grid was, and stepped through it. They walked down the steps to twelve elevators, and Atlas kicked the door open to one, and the P-Body stepped into another. They looked at each other and waved as the elevator whirred and took them downwards.