Also, now that I've actually found the gallery, I can't seem to unlock this chest. I assume it's somewhere in the bat mines, but I can't seem to find it. Any help?
When you enter the room with the purple crystal in the mines, a bat will appear and trap you with a fence. Go and talk to the bat through the fence and agree to their offer.
Thanks! I guess my brain just always immediately went to the blasting powder and never thought to talk to the bat. In retrospect, I dunno how the chest's hint didn't click XD
