Portal is a single-player first-person action/puzzle video game developed by Valve. The game was released in a bundle package known as The Orange Box for PC and Xbox 360 on October 10, 2007, and will be released for the PlayStation 3 sometime in November. The Windows version of the game is also available for download separately through Steam. The game consists of a series of puzzles which must be solved by teleporting the player's character and other simple objects using the Aperture Science Handheld Portal Device, with the goal of getting to an objective point. This "portal gun" and the unusual physics it creates are the main selling point of the game.
Fantastic game that doesn't end when you think it should. GlaDOS, the nefarious but insecure and goofy AI, rocks! Also, like quite a few games I've played recently, it has an ending song that is fantastic. "But there's no sense crying over every mistake. You just keep on trying till you run out of cake." "The cake is a lie!"