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The Portal games are story driven games, as such the scenario takes an important place in the gaming experience.
In the games you play Chell, a young women stuck in an Aperture Science complex forced by the Artificial Intelligence GLaDOS to solve tests in specialy designed chambers using for solving them the Handheld Portal Device.
Portal
The game has two distinct acts, the test chambers and the escape.
Act 1: The test chambers
The game begins with the player awakening in a Relaxation Vault where they are briefed by the disembodied voice of GLaDOS before being released through a portal. The player is introduced to the testing process and mechanics, eventually culminating in the procurement of the Handheld Portal Gun. As Chell makes her way through test chambers it becomes clear the facility is devoid of human life and GLaDOS is testing Chell for her own warped definition of 'science'. Throughout the facility are hidden "dens", containing mad scribblings from an unseen person warning others of GLaDOS. Motivating Chell with the promise of Cake at the end of the testing, Chell is put through tests of increasing complexity. When Chell is no longer of any use to GLaDOS, she attempts to kill her by lowering her into a fire. Thinking quick on her toes, she escapes her fiery fate using the the Handheld Portal Device, Chell makes her way through the inner facility via maintenance shafts.
Act 2: The escape
Making your way through the facility GLaDOS attempts to lure you back with promise of cake and a party, and claims the attempted murder of the player was a misunderstanding. When she realizes her attempts are in vain she resorts to taunting the player whilst continuing her efforts to kill Chell. Eventually Chell reaches GLaDOS's lair, where she finally comes face to face with the rogue AI. It is revealed GLaDOS murdered everyone in the facility with deadly neurotoxin before attempting to do with the same with Chell. Using the Handheld Portal Device, Chell defeats GLaDOS by removing her AI cores and depositing them in a nearby Emergency Intelligence Incinerator, resulting in a large explosion that blows a hole in the roof dragging both Chell and GLaDOS upwards. Chell awakes to find herself above ground in the parking lot of the facility, with the burning remains of GLaDOS surrounding her. The March 3, 2010 Patch modified the ending so that Chell is dragged back into the facility by the unseen Party Escort Bot.
Portal: Still Alive
Portal: Still Alive is a Xbox 360 Live Arcade port of Portal, containing additional content in the form of new advanced chambers, inspired by Portal: The Flash version, with no additional story material.
Portal 2
Portal 2 was released simultaneously on PC & Mac, Xbox 360 and PS3.
Single Player
Chapter 1: The Courtesy Call / Chapter 2: The Cold Boot
Following the events of Portal 2: Lab Rat, Chell is awoken 50 days later in her relaxation chamber, which has the appearence of a motel room, for a 'mandatory physical and mental wellness exercise'. Returning to her long sleep, she is awoken an undetermined amount of time later by an unfamiliar voice at the door to find the room in a state of disrepair and the room intercom warning of an imminent core explosion. Upon opening the door she finds herself face to face with a Personality Core who introduces himself as Wheatley, the jovial AI in charge of the test subjects storage facility. After bringing Chell up to date, Wheatley moves her relaxation through the storage facility, crashing several times and almost destroying the room. After successfully navigating the room to the main facility, Wheatley instructs Chell to go retrieve the Handheld Portal Device, as it will be needed for their escape from the facility. Upon successfully acquiring the device, Wheatley and Chell make their way to GLaDOS's chamber where Wheatley claims a lift to the surface is located. They find the chamber partially destroyed and overgrown wildlife everywhere, and in the middle of the chamber lies the lifeless body of GLaDOS. Navigating to the breaker room under the chamber Wheatley attempts to find the breaker for the lift, in the process inadvertently rebooting GLaDOS. Bitter at the cause of her death, she crushes Wheatley and tosses him away before dropping Chell into the Emergency Intelligence Incinerator, into the incinerator room. GLaDOS instructs Chell to retrieve the two portal Handheld Portal Device, before guiding her back into the facility's test chambers. Fixing the broken down facility while Chell is once again put through testing, GLaDOS, bitter at her murder, informs Chell that her black box forced her to relive her own murder for decades.
Chapter 3: The Return / Chapter 4: The Surprise
While in a test chamber, when GLaDOS isn't watching, Wheatley reveals he survived their encounter with GLaDOS and asks Chell to play along with the testing until he figures out a way for them to escape. GLaDOS's taunts become more vindictive, at one point pretending to reunite the 'orphan' Chell with her family. It becomes clear that Chell does not have much time left, as GLaDOS insinuates her usefulness is coming to an end. While in a test chamber the power is cut out and Wheatley reveals himself from behind a wall panel, under the false impression GLaDOS cannot detect him. When she does he and Chell make a run for it through the inner facility with GLaDOS attempting to halt their progress.
Chapter 5: The Escape
Along the way they pass a 'potato power' exhibition, held on the ill-fated 'Bring your daughter to work day'. While making their way through the Turret production facility, Wheatley reveals he plans to sabotage the Turrets and neurotoxin supply so that when they face GLaDOS she will be unarmed. They successfully carry out their plan by replacing the master Turret template with a Defective Turret and use a giant laser to cut off the neurotoxin supply lines. Hopeful, they make their way to GLaDOS's chamber once again for a showdown. GLaDOS, once again, attempts to kill Chell but is unsuccessful due to Wheatley's and Chell's sabotage. It is at this point that the Announcer informs them that the central core, GLaDOS, is 80% corrupt and because Wheatley is present, a core transfer is initialized. This requires both cores approval, and when GLaDOS objects a stalemate is reached. The Announcer informs them that a stalemate associate is required to press a stalemate resolution button for the core transfer to occur. GLaDOS desperately attempts to block Chell from doing so, but is unsuccessful and the core transfer occurs. Wheatley is transferred into GLaDOS's body and she is removed from power. In jubilant mood, Wheatley sends Chell on her way to the surface before having a change of heart as he revels in his new found position of power. GLaDOS taunts him and in a fit of rage he takes her core apart and places her in a potato battery. It is at this point GLaDOS reveals that Wheatley was designed to be an 'idiot', in order to dampen GLaDOS's brainpower so that she wouldn't attempt to murder everyone in the facility. Angered by this revelation, Wheatley throws her in the lift with Chell and in a fit of rage smashes the lift downwards, where they fall deep into the depths of the facility.