1f:T6a6,

A couple things first.
I'm not a Pro Forger like some of you are...lol
I know I spelt Mombasa wrong...
But here's my map with little no no help from Aeterus Maeror and, Stablest Car, they just threw in ideas.
I used the drop pod idea from rifte gifle so all credit for those go to him.

It's a infection map for as many players as you want.(Set start zombies to 4 less than total players playing for best results.)

Here is the map New Mobbasa.
Here is the game-type ODST DROP.

Now for the pictures.

Overview of the city.

Drop pod ship(Ran out of money was going to make it look better)

When map gets darker.(2 minutes in.)

How it plays:
Four ODST drop down custom power up gives them 15 seconds of invulnerability and they are forced color black. They spawn with Smg and random. There are weapons on the map only Human/ODST can pick up.

Zombies run 25% faster and have full shield but can only take 50% normal damage before dieing. And have 75% gravity. They spawn with two Grenades Plasma Pistol and Sword. Alpha Zombies are brown secondary are purple no stats difference.

One minute in a path spawns to the teleporter you see in the last picture that only Zombies can jump to that bring them up to the Human spawn forcing humans to drop.

5 rounds 5 minutes each.
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EDIT: If you don't like this game-type I'm working on a new one.
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If you have any questions just ask.