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Very annoying bug i know!
But unfortunately flame body doesn't work when you are behind a sub.
It works on PO because it is a glitch and after it is fixed it is going to hurt this set badly...
Whoops, sorry for spoiling the ending... But yeah, Wario Land 4 is a neat little game. I've wasted countless hours on it, myself! That baseball minigame cheats, I swear!