Description:-Portal 2 is a first-person puzzle-platform video game developed by Valve Corporation. It is the sequel to the critically-acclaimed 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.Though initially slated for release in the last quarter of 2010,[7][8] the game was postponed to the week of April 18, 2011. 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.[10] The game's release on Steam was preceded by a second multi-week alternate reality game involving 13 independently-developed titles, culminating in a distributed computing spoof to release Portal 2 several hours early.Portal 2 is comprised of 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. Other gameplay elements were added to Portal 2, including tractor beams, laser redirection, and special paint-like gels, taken from the Independent Games Festival-winning DigiPen student project Tag: The Power of Paint, that imparts special properties to objects it touches, such as increased momentum. Portal 2 also includes a two-player co-operative mode in which the player-characters, the robots Atlas and P-body, have become self-aware due to GLaDOS' influence and using their own individual portal guns, must work together to complete each level. The player returns as the human Chell, having been in stasis for several hundred years, while GLaDOS, a rampant artificially intelligent computer, and the rest of the Aperture Science facility has fallen into disrepair. Chell is awakened by one of GLaDOS's personality cores, and inadvertently wakes GLaDOS; GLaDOS is immediately displeased at Chell's return and begins testing her again through numerous chambers as she rebuilds the dilapidated facility. With a larger story, Valve introduced additional characters, including Wheatley, a personality core voiced by Stephen Merchant, and recordings of Aperture Science CEO Cave Johnson, voiced by J.K. Simmons. Ellen McLain returns to voice GLaDOS. Additional music from Jonathan Coulton and The National appear in the game in response to players' praise from the first game. Portal 2 was universally praised by critics, citing the dialogue and comedy as stand-out elements from the game and applauding the voice work of McLain, Merchant, and Simmons.
Gameplay:-Portal 2 is a puzzle game presented from the first-person perspective. Normally, the player, as either Chell in the single-player campaign or as one of two robots, Atlas or P-body, in the co-operative campaign, can move, look, and carry and drop objects. The goal is to maneuver the characters through a number of test chambers in the Aperture Science facility and traverse the level from the start to the exit. Initial levels provide a tutorial on general movement controls and interactions with the environment. After these levels, the player will be required to solve puzzles in test chambers within the Aperture Science Enrichment Center using the "portal gun" (the Aperture Science Handheld Portal Device), a device that can create two portals connecting two surfaces across space. Players solve puzzles by using these portals to move unconventionally between rooms or to use the ability to fling objects or themselves across a distance. The functionality of the gun has not changed between the games, but within Portal 2, players can take advantage of the bleeding of other physical effects through the portals. One is the ability to use air currents created by Pneumatic Diversity Vents, a series of transport pneumatic tubes, through a set of portal openings to push a turret over or to draw objects into the suction. Another example is the use the power of Excursion Funnel tractor beams through portals to bring Chell or other objects to otherwise inaccessible areas.
Plot:-aPortal 2 takes place after the first game; as part of the Half-Life series, some time after Half-Life 2.Despite her apparent destruction at the end of Portal, GLaDOS, an artificial intelligence computer system, remains functional but dormant. The player controls Chell, the previous protagonist of 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, after which she is placed in stasis for a period of many years. The game will again take place in the Aperture Science Labs, untouched by human hands but overrun by decay and nature.Parts of the story are bookended by the "Rat Man", an unseen character in the first game who escaped from the neurotoxin released by GLaDOS that wiped out the rest of the Aperture staff, and slowly became insane. He wrote messages on walls to guide and warn Chell during the events of the first game; having witnessed GLaDOS' defeat at the end of the first game, the Rat Man's drawings created in the months after the events summarize the first game during Portal 2's introduction. Rat Man, though able to escape after GLaDOS' destruction, returns to the facility following the robot that drags the unconscious Chell back inside. As a final act, he ensures that Chell is kept in indefinite cryostorage, before he himself enters a cryogenic unit after being severely wounded by turrets.
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