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 on November 23, 2007. The Windows version of the game is also available for download separately through Steam. The game consists primarily 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. The goal of each puzzle is to reach an exit point. The "portal gun" and the unusual physics it creates are the emphasis of this game.