GLaDOS, an acronym for « Genetic Lifeform and Disk Operating System », is a rampant artificial intelligence computer system that controls Aperture laboratories, and is the primary antagonist for the Portal series. … You could argue it felt finished after the first game, but Valve got away with making a second. Unlike the Half-Life series, the story of which Valve has left frustratingly incomplete, Portal felt finished after the second game. … Complete two-person co-op: Multiplayer game featuring its own dedicated story, characters, and gameplay. Portal 2 draws from the award-winning formula of innovative gameplay, story, and music that earned the original Portal over 70 industry accolades and created a cult following. If you want a game that you can play through on the weekend that has a great story, then this is definitely worth looking into. Valve does a great job with their storytelling and does a great job of implementing gameplay with the story. Indeed Is Portal 2 worth playing? The story is pretty simple, but it is definitely unique in the way it was written. That one’s dead, after Valve updated it to announce the sequel. … Gender-wise, the robots have their own genders, as stated by Chet Faliszek in an interview (ATLAS as male, P-body as female). ATLAS’ design is based on a Personality Core, while P-body is based on a Sentry Turret. However, you’ll spoil the story of the first one doing that as it is a direct sequel (and there are many references to the first one, in the story and in some puzzle). You can play Portal 2 without having played Portal first as every game mechanic is presented in Portal 2.