

- R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF MAC OS
- R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF FULL
- R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF SERIES
Portal 2 suggests the ship was related as a result of an experimental teleportation device being developed by Aperture to compete with Black Mesa Research Facility, a competitor featured in Half-Life. One hidden area of the game shows the former location of Aperture Science's cargo ship, the Borealis, in the bowels of the facility this ship is mentioned as part the Half-Life universe at the end of Episode 2, having been discovered in the Arctic, situated in a seemingly-impossible position with all hands lost. The game again takes place in the Aperture Science Labs, untouched by human hands but overrun by decay and nature. 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, later identified by writer Erik Wolpaw as the "Party Escort Bot", after which she is placed in stasis for a period of many years. The test chambers, after an unspecified time of decay and abandonment. The player controls Chell, the previous protagonist of Portal. Despite her apparent destruction at the end of Portal, GLaDOS, an artificial intelligence computer system, remains functional but dormant. Portal 2 takes place after the first game as part of the Half-Life series, some time after Half-Life 2. Reviews also highlighted the new gameplay elements, the game's challenging but surmountable learning curve, and the addition of the co-operative mode. The game's writing, pacing, and comedy were highlighted as stand-out elements, with critics applauding the voice work of McLain, Merchant, and Simmons.
R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF FULL
Though many reviewers were concerned about the difficulty of expanding Portal into a full sequel, critics universally praised Portal 2.

Portal 2 also includes a two-player co-operative mode in which the player-characters, the robots Atlas and P-body, must work together to complete each test chamber using their own individual portal guns. Additional music from Jonathan Coulton and The National appear in the game. With a larger story, Valve introduced additional characters, including Wheatley, voiced by Stephen Merchant, and recordings of Aperture Science CEO Cave Johnson, voiced by J.K.

Chell must navigate the dilapidated Aperture Science Enrichment Center and its test chambers with the portal gun while the facility is rebuilt by the reactivated GLaDOS, a rampant artificially intelligent computer. Within the single player campaign, the player returns as the human Chell, having awakened from stasis after several hundred years. Other gameplay elements were added to Portal 2, including tractor beams, laser redirection, and special paint-like gels that impart special properties to objects they touch. The game's unique physics allow momentum to be retained through portals, requiring creative use of portals to maneuver through the test chambers.
R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF SERIES
Portal 2 comprises a series of puzzles that must be solved by teleporting the player's character and simple objects using the "portal gun", a device that can create inter-spatial portals between flat planes. The game's release on Steam was preceded by a second multi-week alternate reality game, the Potato Sack, involving 13 independently-developed titles, culminating in a distributed computing spoof to release Portal 2 several hours early.
R THE STORY LINES OF PORTAL AND PORTAL 2 DIFF MAC OS
The game was released by Valve through Steam for Microsoft Windows and Mac OS X, while the PlayStation 3, Xbox 360 and retail Windows/OS X versions of the game are distributed by Electronic Arts. Though initially slated for release in the last quarter of 2010, the game was postponed to the week of April 18, 2011. It is the sequel to the 2007 video game Portal and was announced on March 5, 2010, following a week-long alternate reality game based on new patches to the original game. Portal 2 is a first-person puzzle- platform video game developed by Valve Corporation.
