Portal 2 is the sequel to Portal and offers the same first-person puzzle-platform gameplay. Players continue the story taking the role of the young woman Chell, who defeated the artificial intelligence computer system GLaDOS in the first game. After the events of the first game, she was placed in stasis...

Portal is a single-player puzzle-platform video game developed by Valve Corporation. The game was released in a bundle package called The Orange Box for Microsoft Windows and Xbox 360 on October 9, 2007, and for the PlayStation 3 on December 11, 2007. The Windows version of the game is also...