What is Portal 2?
{{Infobox VG |title = Portal 2 |collapsible = |state = |image = Portal 2 Official Logo.png |caption = Logo |developer = [[Valve Corporation]] |publisher = Valve Corporation |director = Joshua Weier |producer = [[Gabe Newell]] |designer= |programmer= |artist = Jeremy Bennett<br>Randy Lundeen <small>(art directors)</small> |writer = [[Erik Wolpaw]]<br>[[Jay Pinkerton]] |composer = Mike Morasky<br>[[Jonathan Coulton]] (song) |series = Portal |engine = [[Source (game engine)|Source]] |released = '''Retail'''<br>{{Video game release|NA|April 19, 2011|EU|April 21, 2011|AUS|April 21, 2011}}'''Steam'''<br>{{Video game release|[[International|INT]]|April 19, 2011}} |genre = [[Puzzle video game|Puzzle]]|modes = [[Single-player video game|Single-player]], [[Cooperative gameplay|cooperative]] |platforms = [[Linux]],<ref>{{Cite web |url=http://steamforlinux.com/?q=en/node/387 |title=Archived copy |access-date=2015-06-26 |archive-date=2015-06-26 |archive-url=https://web.archive.org/web/20150626130452/http://steamforlinux.com/?q=en/node/387 |url-status=dead }}</ref> [[Microsoft Windows]], [[Mac OS X]], [[Xbox 360]], [[PlayStation 3]] }} '''''Portal 2''''' is a [[first-person shooter|first-person]] [[puzzle]] [[video game]] made by [[Valve Corporation]]. It is the [[sequel]] to the video game ''[[Portal (video game)|Portal]]''. The gameplay is similar to the first game, but it adds new stories, puzzles, and characters. Unlike the first game, it also has a [[cooperation|co-op campaign]], where two players play as [[robot]]s built by GLaDOS to solve puzzles that could never be solved by humans. ==Plot== After killing GLaDOS and escaping Aperture Science Laboratories, Chell, the [[protagonist]] of ''Portal'', is taken back to the labs and placed in [[suspended animation]] for many years. While she sleeps, the laboratories become more and more run down, because no one is there to take care of them. Once she