I made a Zombies map on Sandbox. It is essentially a giant box with tunnels attached to the walls about 2/3 of the way up. The humans spawn in the middle of the box, zombies in the tunnels. Tunnels protected from spawn-kills by shield doors. LINK: Halo 3 File Details
Sigh, why can't all you new guys read the rules? Please go to the Embed Screenshots in your Map Thread. No one else post anything like this unless you are a mod.
Calm down he just needs a little help Like he said read that, and learn to post it right, make sure to have good screen shots, and I will download map, and write a good review, but get pictures up, you have a limited time or it will be deleted :/
Sorry! Didn't notice that thread... Will be able to post some pics in a couple of hours - not at home atm.