Portal 2

Despite her apparent destruction at the end of Portal, GLaDOS, an artificial intelligence computer system, is "still alive". The player controls Chell, the same protagonist from Portal; retroactively patched just prior to the sequel's official announcement, the ending of the first game shows Chell being dragged away by an unseen figure with a robotic voice, where she has been placed in stasis over the years. The game will again take place in the Aperture Science Labs, untouched by human hands but overrun by decay and nature. Portal 2 will continue to challenge the player by solving puzzles in test chambers within the Aperture Science Enrichment Center using the portal gun (the Aperture Science Hand-held Portal Device), a device that can create two portals connecting two surfaces across space.