Portal is a new single player game from Valve. Set in the mysterious Aperture
Science Laboratories, Portal has been called one of the most innovative new
games available and will offer gamers hours of unique game play.
Players must solve physical puzzles and challenges by opening portals to
maneuver objects, and themselves, through space.
This is the nonsteam (extracted) edition of Portal. It is a clean rip that doesn't require the Steam Client in order to start the game, and includes a nice installer.