There Are Many

Zombies are smart they spawn in herds with powers and get faster at night and evolve you will be scared day and night. You hear the screams of the undead in cities and you can't sleep because of it there are many guns and cars to explore and fight so you are safe but zombies can get you anywhere you go you dig into a wall they will shortly come you build up they will jump, climb, and even FLY up to you. There is no escape so rebuild humanity from the ground up.