The aliens are invading and they want to take planet earth as their own, so there will be no more survivors this time. As if, that is bad enough, the dead are arising from their graves and feeding on the mankind. Their numbers grow by the minute since each people they kill becomes one of them. You need to escape or you will die soon.
Drive a car and try to escape the city. The car is loaded with weapons. Grab some fuel, arsenal, force field and money while you are on your way. All of them are useful and can save your life. Use the money to upgrade your car.