>>536317540
Imagine a zombie mode during halloween where the streets are FULL of zombie NPCs and only the rooftops are safe. But objectives on the street and some even underground so you have to clear out areas and not die.

Eventually the zombies get smart enough to climb up/spawn up there and shit which is when the mode reaches its climax and you have to fight a midboss while zombies swarm. You also defend areas like it's a tower defense