Quote from Moezso
@5thHorseman, I assume by the wording of the rules ("Do not kill yourself in ANY way for ANY purpose.") that jumping through a hole in order to stick a block on the underside of the world is cheating?
That was actually the specific trick I was thinking of when I decided to not list things and just say "ANY way for ANY purpose," so yes You'll have to wait until you get water buckets or pistons before you can explore downward.
Btw, great map, one of my favorites for limited resource survival. The single layer of dirt concept is a unique challenge, it's precarious like skyblock but with a false sense of security, and makes creepers much more deadly.
I agree. It seems easier until you realize that there's an infinite plane for bad guys to spawn.