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I've got a good one. Whenever metal reaches fullspeed or gets fast enough an eletric force field surrounds him. It's will make him immune to space, lava, and of course badniks. but apon entering water like this will decrease your rings. won't kill tho.
I have an idea on a way to get the Super Emeralds...
Maybe you can randomize the location on the map of the Super Emeralds but not hide it in walls.
If that takes too much time... then try making new special stages?
Sorry but that's all I can come up with.