Evacuate The Apocalypse

You must survive at least 90 seconds for the evacuation helicopter to arrive. The helicopter will stay for 30 seconds if you don't make it in time you will automatically lose the game. 

If you make it within those 30 seconds you would escape and win the game.

Shoot zombies to defend yourself

There will be medkits scattered across the map to allow you to heal yourself when you are near one you will see it glow in the dark and you will hear a gloomy sound effect.