Not counting sales through Steam, over four million copies of the game have been sold since its release. It received acclaim for the character of GLaDOS, voiced by Ellen McLain in the English-language version, and the end credits song "Still Alive" written by Jonathan Coulton for the game. The game received praise for its unique gameplay and darkly humorous story. Portal was acclaimed as one of the most original games of 2007, despite being considered short in length.
This gameplay element is based on a similar concept from the game Narbacular Drop many of the team members from the DigiPen Institute of Technology who worked on Narbacular Drop were hired by Valve for the creation of Portal. The game's unique physics allows momentum to be retained through portals, requiring creative use of portals to maneuver through the test chambers. The player-character, Chell, is challenged by an artificial intelligence named GLaDOS (Genetic Lifeform and Disk Operating System) to complete each puzzle in the Aperture Science Enrichment Center using the portal gun with the promise of receiving cake when all the puzzles are completed. The game primarily comprises a series of puzzles that must be solved by teleporting the player's character and simple objects using "the Aperture Science Handheld Portal Device", a device that can create inter-spatial portals between two flat planes. A Mac OS X version was released as part of the Mac-compatible Steam platform on May 12, 2010. A standalone version called Portal: Still Alive was released on the Xbox Live Arcade service on Octothis version includes an additional 14 puzzles. The Windows version of the game is available for download separately through Valve's content delivery system Steam and was released as a standalone retail product on April 9, 2008.
The game was released in a bundle package called The Orange Box for Microsoft Windows and Xbox 360 on Octo and for the PlayStation 3 on December 11, 2007. Portal is a 2007 first-person puzzle-platform video game developed by Valve Corporation.
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