Valve has released the final two parts of their Portal 2 video extravaganza. And now we see that things will be quite messy this time around with the Propulsion and Repulsion gel. You can see everything below in these videos and boy are they quite complicated. Also the second video contains video of all the various additions working with one another. Plus we see some deadly spiked walls of doom slamming down on what could have been the poor test subject.
Personally I enjoy the way that the gel actually moves around and flies through the air; as well as the skidding that the propulsion gel causes. The repulsion gel itself is another useful tool but seems just like a movable aerial faith plate.