Hmm... Malevolum at the center, and NYC around the ground level, or Genius City... Empty Fields is connected to Bastion Cliff... Swamp could be connected to the Woods, and then that's connected to the Empty Fields. World's Core is way below everything... Dunno whether to put The Broken Pieces above or below Cloud City, but they're floating above the Malevolum for sure. Or maybe Cloud City could be one of the levels of Malevolum now. World Arena, NYC, and Genius City could be as well. But ROTTA is definitely above Broken Pieces and Malevolum. One level of Malevolum could be an RST stage, or really, anywhere.
Dunno what to do with the fog.
Oh, and speaking of Terrain:
Anastasia: Prefers places where she can hide, blend in, and lots of toys for her to play with. Doesn't like being out in the open, and terrain that is insanely hazardous.
Arctrus: Prefers Aerial and wide open spaces for battlefields. Hates cramped spaces.
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My Little Phineas and Ferb: Summer is Magic!
Aww, I lost to SuperNiceDog, Winner of the Rivalry Rumble Guru Contest