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None that I'm aware of, but you can just repeat stages like 3-1 (Marshlands) to get as much treasure as possible without fighting any enemies (I suggest using Google to find a strategy), then quitting, selling the treasure, and either repeating or doing whatever you like with the new money. I am not aware of any particular cheats or glitches with quick ways to beat bosses/enemies/stages, your best bet would be a strategy guide