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In Portal, the player controls the protagonist, Chell, from a first-person perspective as she is challenged to navigate through a series of rooms using the Aperture Science Handheld Portal Device, or portal gun, under the watchful supervision of the artificial intelligence GLa DOS.The portal gun can create two distinct portal ends, orange and blue.This gameplay element is based on a similar concept from the game Narbacular Drop; many of the team members from the Digi Pen Institute of Technology who worked on Narbacular Drop were hired by Valve for the creation of Portal, making it a spiritual successor to the game.Portal was acclaimed as one of the most original games of 2007, despite criticisms of its short duration and limited story.The game features two characters: the player-controlled silent protagonist named Chell, and GLa DOS (Genetic Lifeform and Disk Operating System), a computer artificial intelligence that monitors and directs the player.In the English-language version, GLa DOS is voiced by Ellen Mc Lain, though her voice has been altered to sound more artificial.For example, a common maneuver is to jump down to a portal on the floor and emerge through a wall, flying over a gap or another obstacle.
Neither end is specifically an entrance or exit; all objects that travel through one portal will exit through the other.
As GLa DOS puts it, "In layman's terms: speedy thing goes in, speedy thing comes out." If portal ends are not on parallel planes, the character passing through is reoriented to be upright with respect to gravity after leaving a portal end.
Chell and all other objects in the game that can fit into the portal ends will pass through the portal.
Excluding Steam download sales, over four million copies of the game have been sold since its release, spawning official merchandise from Valve including plush Companion Cubes, as well as fan recreations of the cake and portal gun, a standalone version, titled Portal: Still Alive, on the Xbox Live Arcade service in October 2008, which added an additional 14 puzzles to the gameplay, and a sequel, Portal 2, which was released in 2011, adding several new gameplay mechanics and a cooperative multiplayer mode.
A representation of how the (magnitude of) linear momentum is conserved through portals.