Story
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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 scenario of these games can be divided in two main acts, the first act in which Chell tries to solve test chambers and a second act where she escapes the testing area and tries to reach GLaDOS.
Act 1: The test chambers
The game begins with the player awakening in a Relaxation Vault where they are briefed by an unseen voice, GLaDOS, before being released through a portal. The player is introduced to the testing process and mechanics cumlinating 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'. Hidden dens are found along the way, containing 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, GLaDOS attempts to kill her by lowering her into a fire. Escaping her fiery fate using the the Handheld Portal Device, Chell makes her way through the facility via maintenance shafts.
Act 2: The escape
After having escaped the furnace using portals, you start roaming in the backstage of the tests chambers and the Aperture complex, with GLaDOS telling you to come back at first, promising you cake and a party with all your friends. But the more you progress in the backstages of the laboritories the more GLaDOS become aggresive, placing turrets and rocket launching turrets to block your way and try to kill you. In the end you finaly reach, after multiple traps, a huge circular room where you met GLaDOS.
When you arrive in this room GLaDOS announces she's going to give you a surprise, but instead of it one of her core falls down which you can throw in the Emergency Intelligence Incinerator. At that moment GLaDOS voice gets less computerize, smoother, and she reveals that if we never encounter any human it was because she killed them all with neurotoxin, and start floading the room with neurotoxin, leaving you roughtly 5 minutes to live.
She activates a rocket launching turret that allows you, by redirecting missiles to detach the remaining cores off of GLaDOS and throw them in the incinerator too, detroying and killing her, and freeing you from the complex. You open your eyes after a white screen, in the middle of metalic pieces (with Hoopy the Hoop rolling), then a robot grabs you and pull you back, finishing the game.
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.
Portal 2
Portal 2 was realeased simultaneously on PC & Mac, Xbox 360 and PS3 so the story is the same for each platforme.
Single Player
The narration in Portal 2 is completely differente, it introduces a clear separation in chapters (similar to the chapter in Half-Life), each chapter making the story progress. You still play Chell, equipped with the Portal gun, but the testing isn't a significative part of the story, not as much as in the original game, the story has more depth than simply testing.