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Spoiler Alert!
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There is a secret hat at the beginning area. When you talk to the first creature in the game, on the stairs design it's half covered in rocks, go to the next area and jump back into the previous area into the rock area. This will lead you into a little cave with a hat in it.
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Review
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This game is very artistic and addicting. I enjoyed the whole series of this game. Any game that can keep me playing for a good while, deserves a good 5 stars.