Item description:

I am somebody who enjoys SWEPS. I just, dunno, like them. And after several rounds of spawning my own zombies on gm_compound, I decided to make a map that had respawning ammo and unlimited enemies.
This lead to zm_backalley_b3 which is a pretty decent map for MY standards. And well, you can just find it up on Garrysmod dot org.

zm_backalley's biggest problem was that it didn't really feel like anything. It felt like an arena rather then a well... backalley. I blame this on the amount of effort I put into brush work. It still bothered me, how sloppy it all looked, so I decided to make a new one. This new one actually back-fired on me and ended up to be completely crap. Then i watched the Yogscast's L4D playthrough of "Questionable Ethics" and wanted to see if I could make something like that. This is the result.

Basically it's a building map that can spawn antlions. No really.
You walk out of the dark orange room and huzzah! A small building area and some pools of water. But what's with the pipes? Well, if you head back inside and press the keypad BAM! Hoards of antlions shall now spawn from the pipes and attempt to knock you with their leg thingies. But don't worry! You have unlimited ammo re-spawns to help with the invasion of alien bugs!

Although it's made for gmod, it can work with Gmod, Half Life 2

EDIT: Forgot to build cubemaps. My bad. (it's fixed now)