Quarantine Mode
Playing as human-hide in groups near elevator and near medical room only shoot zombies when you have a chance to knock them down, dont waste ammo, When elveator and room is ready get inside,lock the door, and shoot em away from the door.
Playing as Zombie-Wait for a chance to get to human when either reloading, or out of ammo but dont go near them when there is a chance of you falling. Try not to let them get in elevator or medical room.
quarintine ode is just stupid, it fails. It is impossible for humans to win.