Portal is a single-player first-person action/puzzle video game developed by the Valve Corporation. The game was released in the bundle package The Orange Box for Microsoft Windows and Xbox 360 on October 9, 2007, and for the PlayStation 3 on December 11, 2007. The Windows version of the game is also 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 consists primarily of a series of puzzles that must be solved by teleporting the player's character and other simple objects using the Aperture Science Handheld Portal Device ("Portal Gun" for short), a unit that can create an inter-spatial portal between flat planes. The player character is challenged by an AI named "GLaDOS" 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 unusual physics allowed by the portal gun are the emphasis of this game, and is an extension of a similar portal concept in Narbacular Drop; many of the team from the DigiPen Institute of Technology that worked on Narbacular Drop were hired by Valve for the creation of Portal. (more...)