As part of Valve’s summer announcement fanfare, they mentioned a game called “Portal”, a commercial update of the free student game “Narbacular Drop” by Nuclear Monkey Software. Built around the interaction of different Portals, it allows the user to weild a “Portal gun”, allowing the creation of portal entry and exit points on different surfaces. These portals allow objects (including the player) to pass between them, allowing the player to progress through each level by disabling obstacles and reaching the exit. It reminds me of Peter Molyneux’s “The Room”, which he demonstrated at GDC last year.

The trailer below definitely explains things better:

Thanks again fun-motion and Edge.