They came out of nowhere and started feasting on the people of the city. Now, there are only a handful of survivors and you are one of them. You need to keep on living. The game is about a zombie apocalypse and you need to keep on shooting to survive. Every kill would earn you money and you can buy some strong weapons with it. The game would be a lot tougher no doubt, so you need some powerful weapons to go by. You would need to explore a lot of areas to make sure that you get rid of the undead.