Okay so i know ive posting ALOT recently but this is serious.
On KitPvP on the Spleef event, there is a glitch when you have a snow block.
When you have a snow block, you can actually go onto the wall of the arena and place glitched blocks up the side of the wall and jump before the block dissapears. This can be used to get back up to the next layer. A way to prevent this would to be for crafting to be dissabled for the duration of the game.