For all of its expert writing and interesting characters, the gameplay of Portal is where it truly shines. Levels, broken up into different "test chambers," challenge the player in new and unexpected ...

Portal is part of The Orange Box. Don't forget to check out our reviews of the also-included Half-Life 2: Episode Two and Team Fortress 2. As the only part of Valve's Orange Box package that isn't a ...

All the Latest Game Footage and Images from Test Chamber Test Chamber is a stylish, difficult, and not-quite-euclidean puzzle game. Guide our cube-headed hero through a mind-bending world, with levels ...