Valve showed off the first glimpse of actual gameplay footage for their upcoming standalone title, Portal 2. The first part reveals how GlaDOS is trying to resurrect herself years after the events of the first game and the other two parts show off the new gameplay features of the game.
Portal 2: Part 1 Gameplay Footage
Portal 2: Part 2 Gameplay Footage
Portal 2: Part 3 Gameplay Footage
