No seriously. Use your ‘gravity well’ to fling out balls of energy at the never ending horde of tanks that are trying to drive past. The realistic physics model allows you to crash the tanks into each other, and the walls, creating chain reactions of collisions. As you advance levels you get points to develop your defensive arsenal including the acquisition of god like smiting powers! The fun will never end.
About time as I was looking for something to replace Tower Defense! You can play in your browser but I recommend downloading and running it standalone – even then it is pretty intensive, so if it lags, get yourself a new computer.
linkage: via i am bored