If you want the GeoJacket, go all the way down in Tainted Grotto (B3) and press "X" on the pile of human bones just behind the dream circle (which if entered activates a purple gem switch which I don't know what the crap it does). rate this up if you this comment to be seen forever or not rated to be lost in the next five comments.
After you beat the Dark Temple, people said you could go back in. If that's possible, can someone please tell me how and where? If you can respond really fast I will be very grateful. Thanks!
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