Interplanetary
Go from planet to planet.
Iodine-127 hasn't uploaded any World of Goo Corporation towers.
Like Beauty and the Electric Tentacle, but you build an actual bridge accross a spike pit. You have to get the Beauty to the Ball Buster on the other side of the map, then build up to the pipe. You get one bone goo.
Use the green goo to get from the top of the level to the very bottom. Use a strategy similar to that of the first half of Upper Shaft, to make a rope for the GooBalls to climb from platform to platform.