Portal 2 is a first-person puzzle video game developed and published by Valve Corporation. The game is the sequel to the 2007 game Portal, where players must solve puzzles and manipulate their environment using a handheld portal device. The story of Portal 2 takes place in the Aperture Science Labs several hundred years after the events of the first game. The main character, Chell, awakens from stasis and finds herself in a dilapidated Aperture Science facility. She is guided by a sarcastic and manipulative AI named GLaDOS, who is intent on using Chell in various experiments. A huge part of the game revolves around Chell and GLaDOS' interactions, with each trying to outsmart the other. One of the biggest additions to the game's lore is the introduction of a new character, Wheatley, a personality core that was originally designed to help GLaDOS. Wheatley, however, becomes Chell's ally as they both try to escape Aperture Science's abandoned facility. As the game progresses, players le