Valve's sequel to first-person puzzler hit Portal has more than just portals, cubes and more portals. In addition to Aerial Faith Plates, Excursion Funnels, Pneumatic Diversity Tubes and Thermal Discouragement Beams, there's... gel.

Specifically, the Repulsion Gel, which is a fancier term for a gooey trampoline, and the Propulsion Gel, which will rocket Chell and friends through portals and across testing labs at incredible speeds. See?

Portal 2 is still, as of today, scheduled for a 2011 release on the PC, Mac, PlayStation 3 and Xbox 360.