This is TNT Run (in hardcore version!) a well known minecarft server minigame. But this is different- this is VERY hard. Up to 4 players in this game, there is only 1 floor, and that's it. So good luck!

(You may play in single player instead of 2-4, but it doesn't matter.)
Also, don't cheat after you fall in the void. When you re spawn, go to creative, turn invisible and spectate.

UPDATES: June 14th, 2013: Spawn Area Changed to higher point, due to players instantly dying when crossing under it.