I just want to make sure that it isn't some kind of game ending thing inside that will make me lose my map and progress.
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It's a single room with an empty, rotating heart atop a waterfall. You won't lose any progress and you can leave it whenever you want.

What do you do with it?
You can collect three heart pieces to fill it. (image)
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But we still don't know what to do after having the three heart pieces... – Gimlao Apr 19 '12 at 08:27
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