Sky City Zone is the twelth zone of Super Sonic Doom. Act 1 Begins in the sky on an airship, with lots of buildings and shacks. You will Encounter Gluttony, and he will make the Boss fight A Challenge for you, he will Appear A Cyberdemon in the Platform Arena. The Music for this Act is "Sky Chase Zone", Sonic 2. Act 2 Starts on a big floating platform. There is a door to be opened to advance to the next part.