- That One Level: The Plains Arena. Rain Foes are completely invisible unless it's raining, and even then you still have to squint to see them. The Plains are 'covered' in them and a switch needs to be pulled to bring the rain on, which 'switches back off' after a short time and needs to be pulled again. And if you think taking it steady and paying heavy attention to where Rain Foes are is a vialble option, there are actually 'two' Rain Foes that you have to come into contact with in order to change the Arena's fire pit numbers.
http://tvtropes.org/pmwiki/pmwiki.php/YMMV/Infernium
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