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 on the horizon and will offer gamers hours of unique gameplay.
The game is designed to change the way players approach, manipulate, and surmise the possibilities in a given environment; similar to how Half-Life® 2's Gravity Gun innovated new ways to leverage an object in any given situation.
Players must solve physical puzzles and challenges by opening portals to maneuvering objects, and themselves, through space.

Overwhelmingly Positive

Acquire the fully powered Aperture Science Handheld Portal Device.

Do whatever it takes to survive.

Make the correct party escort submission position decision.

Beat two Portal advanced maps.

Beat four Portal advanced maps.

Beat all six Portal advanced maps.

Earn bronze medals on all Portal challenges.

Earn silver medals on all Portal challenges.

Earn gold medals on all Portal challenges.

Detach security cameras from the walls.

Knock down a turret with another turret.