I made this a long time ago! When I was a noob! I think it's pretty unique. All built in survival on a server, thanks to the admins who provided the giant walls surrounding the city and mob spawners.

This build was inspired by Left 4 Dead.

Strongly recommend playing it with a friend. Up to 4 players. When you spawn, wait around for one minute to allow the zombies to spawn. Have fun!

Diamonds? This one took me like half a month to build.
and it is quite big, a good solid 30 minutes of gameplay till the end. unless your on easy or flying over everything.

PS. Update your MCEDIT! it stopped showing blocks because the client itself is out dated. Download the newest one. Thats what I did.