This is the best UHC box available! It is all inclusive, MCedit it into a world and it will be working immediately!

This box has no need for Bedrock walls, it contains a command block forcefield to control everything. (By default, the forcefield is set for a 500 block radius from x=0,y=0 on the map.) If you come to close to the forcefield, 10 blocks from it you get a warning, and once you hit it, you get tp'ed back two block!

Features:
~automated (hit a button to start)
~Play in Teams or in PvP
~Anti-Creative set-up
~health is displayed in "tab" menu
~Kills is displayed in sidebar
~Eternal day is active

~Work in Minecraft 1.6.1~

Thanks to qw0x for help with the Forcefield commands