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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.

Wolf
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Mu11etMan
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  • Just wanted to link to the question that answers actually this: http://gaming.stackexchange.com/questions/63197/3-heart-cube-pieces-what-next – Guillochon Sep 29 '13 at 16:52

1 Answers1

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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.

empty heart

What do you do with it?

You can collect three heart pieces to fill it. (image)

Wolf
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