Portal 2 (Part 2) - PC Gameplay - (2K 60fps)
Portal 2 takes place an indeterminate amount of time, somewhere between 50 and 50,000 years, after the events of Portal, which saw Chell destroying the sentient computer GLaDOS, and landing outside the facility, only to be dragged back inside of Aperture Science where she was ultimately placed in a Relaxation Chamber by Doug Rattman for the indefinite future.
After considerable time has passed, Wheatley, a personality core, that has helped to maintain Aperture Science during the absence of GLaDOS arrives at the room of the awakening Chell. With a desire to flee the crumbling facility, Wheatley and Chell begin their quest to escape Aperture Science to return to the real world. After separating from Wheatley and completing a series of tests revisited from Portal, Chell reunites with Wheatley and head to what they believe will be escape. They must cross through the chamber of GLaDOS who lies broken and dismembered on the floor of her chamber, they enter the breaker room looking for a way out, and instead accidentally reactivate GLaDOS. They rise up through the floor just in time to witness GLaDOS pulling herself back together and taking over the facility again. Chell and GLaDOS quickly reunite, culminating with GLaDOS using a robotic arm to drop Chell into the incinerator, and guiding her back towards a new series of tests that GLaDOS intends to force Chell to run continuously until she dies.
Meanwhile, Wheatley attempts to find a way to get out from under GLaDOS and continue their attempt to escape facility, with Chell's help, he intends to disable her turret production line, disable her Deadly Neurotoxin and then shut her down once again to facilitate their escape. He reunites with Chell and they escape through the bowels of the building. After achieving their goals and enter GLaDOS' now rebuilt chamber, the computer system detects an alternate core and begins the process of a core transfer, which GLaDOS promptly refuses, prompting the Stalemate Button to be activated. Chell works her way to the button, finally hitting it, which then swaps out the cores of GLaDOS and Wheatley. Wheatley, corrupt with the power from the entire facility of Aperture, quickly turns on Chell, and shoves GLaDOS into a potato battery as revenge. He knocks them down an elevator shaft where they fall to the remnants of the previous incarnation of the Aperture facility.
GLaDOS (in potato form), has now informed Chell that Wheatley was designed to make extremely poor decisions, in order to turn GLaDOS into somewhat of a moron in an effort to control and dampen her homicidal tendencies. She informs Chell that Wheatley's lack of stability is going to cause the destruction of Aperture Science killing everyone and everything inside the facility. Before Chell can decide whether or not to help, GLaDOS is swooped away by a bird and Chell heads off to attempt to find a way back into the primary facility.
Chell uncovers the remnants of a 1950's Aperture Science guided by the voice of the now deceased Aperture Science founder Cave Johnson. She enters a series of tests, often having to navigate between them in unconventional ways due to the deterioration of the lower facility. At this time we learn of Cave Johnson's secretary/assistant, Caroline, of whom Cave is rather fond. Chell reunites with GLaDOS in the nest of the bird that took her. GLaDOS, insistent that she can't lie with only 1.1 volts of power, implores Chell to take her with her to put her back in her body and stop Wheatley from destroying the facility. Chell ultimately agrees and attaches GLaDOS to her Aperture Science Handheld Portal Device and they continue to try to find a path towards the upper facility.
As Chell continues to run through tests from the 1970's, and 1980's, GLaDOS becomes curious about Caroline and Cave who she keeps hearing in the recorded guidance in test chambers. She comes to a realization, that she chooses not to share with Chell, and they head towards the newer Aperture facility. In an effort to get back up, Chell must turn on pump stations Alpha, Beta, and Gamma which connect Repulsion Gel, Propulsion Gel, and Conversion Gel to the newer facility. Repulsion and Propulsion Gels were Apertures attempt at a dietary supplement, whereas Conversion Gel, made from crushed up moon rocks which ultimately lead to the death of Cave Johnson, is used as an ideal portal conductor. When painted on any surface, the ASHPD can be used as designed. They reach the newer facility where Wheatley has taken full control.
Wheatley, now in the body of GLaDOS which has a built in euphoric response to testing, forces Chell to begin a series of tests to fill Wheatley's new found insatiability for testing. These begin with a rather weak attempt by Wheatley to create a test chamber, but ultimately lead to test chambers stock piled by GLaDOS and shoved together crudely by Wheatley.