GTA: Deliverance Game
You fear that the world would come to an end, so in preparation for the zombie apocalypse, you have your old truck remodeled. It was a success, but, you need to pay the mechanic. You don't have money, so the mechanic ask you to deliver something for her granny. The game is about delivering and you need to find something to deliver in this game. You don't have to use the gun mounted on your truck, but it won't be a bother anyway. The game gets harder and much more difficult as the pick-up point would be much farther. It means that you need to explore the city to get there. Anyway, you need to deliver the items on time.