Although it's been a while now since Valve released the amazing Portal 2, I wanted to shine a light on their lovely teaser films that they ran out prior to release to hilight some of the game's new features. Valve are probably the best games developer in the world at the moment and one of the things that sets them apart is their attention to detail and the personality they imbibe their products with. In case you missed them first time round, here are the Aperture Investment Opportunity films. Put the kettle on and watch with a nice biscuit. Perhaps a Jaffa Cake?