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I see, although in the area i'm at in the castle there doesn't appear to be either of those particular enemies. I guess I would have been screwed if I wasn't playing on an emulator, thankfully I was using save states and wasn't using my save file as frequently, I had it saved in a spot in the castle before I used up my keys and was able to progress. Thanks for the info though, it appears it is actually possible to get stuck in this game, I guess i'll need to make sure to bring extra keys/mattocks for future reference.