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Portal ™is a new single player game developed by Valve. Set in the mysterious aperture technology lab, Portal has been hailed as the industry's most creative new game, which will bring players a unique gaming experience for dozens of hours. The game is designed to change the way players deal with, deal with, and speculate about possible situations in a particular environment; similar to Half-Life ®2's Gravity Gun, which opens up new ways of dealing with targets in a particular environment.