Do you have the BBEANS AI pack?If so, find bbhaz.py in the Arenas folder. Open it up, and delete the line where it saysin_list = FalseThis will un-hide the arena.
My god you're powerd by Satan Himself!
Here: http://beetlebros.gametechmods.com/robotarena.htm and scroll down a bit.
I think SM is a pretty cool guy, eh builds unicycle-bots and doesn't afraid of anything