I recently got this idea, but didn't go through with it yet. Is getting all but 1 of the required crabs, then losing a life and, assuming you haven't touched a checkpoint, turn around at the start and warp to the end of the level and get that crab? This would cut the level time down a lot. I want to know, because I didn't want to be accused of cheating for submitting a 15-second time for the level, plus nothing in the rules forbids it.