These portals are fired from your portal gun using either the left or right-mouse button, and are placed against walls, floors and ceilings. You can have two open at any given time, one blue and one red. It's far more interesting than Episode Two, and as it all sits in one easily digestible four-hour long lump of gaming, you'll beat it in one gloriously fun sitting.

1 already know the answers, and as silly as it sounds, Portal is a game just as much about its story and narrative structure as its puzzle aspects. Is this cake a devious and imaginary incentive? Is it chocolate? These are just two of the questions you'll no doubt be asking. Throughout, the sarcastic, disembodied voice of GLaDOS - an experiment controlling Al routine - guides you methodically from test to test, with promises of eventual cake should you The game is made up of a series of unexplained tests through the clinical confines of the Aperture Science Enrichment Centre, each one a puzzle to be solved using the eponymous portals.

Portal is anything but just a pleasing bonus for The Orange Box, and is instead the most intriguing, original, and surprisingly brilliant part of the triptych. Who'd Have Thought that the runt of The Orange Box litter, having been pecked half to death by it's more established and anticipated franchise siblings, would have fallen from the nest not into the waiting jaws of a metaphor, but into a glowing hole in the ground, popping out of a nearby wall, and into our hearts.

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