Bombs explode, destroying most things within a 3-square radius if beethro (or any other character) touches them with a sword, or if a fuse burns into the bomb (there are no fuses in this room, so don't worry about those). So you have to beat the room without touching any of the bombs. I think, though, that the mimic should be placed in the area with the tar since there's a black gate on the other side of the bombs. You need to clear the tar with the mimic without beethro touching any bombs.
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