Each section is a different landscape. I can't exactly remember who all built what, when I save things I generally name it something like save3 or test5 and don't keep any notes, so this is basically to the best of my memory.
World 1 was originally constructed by Badspot, and expanded on by Ephialtes and myself. It's possible Kaje and Nitramj helped on it too and I just forgot about them.
World 2 was constructed by myself.
World 3 was constructed by Rotondo, entrepreneur in, Nitrmaj, Badspot, Kaje and myself.
World 4 was constructed by myself.