The dead has risen from their grave and now they are very hungry. They would surely get any supplies that you have been hiding in your house. You need to be vigilant and protect your house. The idea here is to not let a single zombie come close to your house. They would get all the supplies that you have been hiding. The game is over when there are no supplies in your house. Each zombie kill would earn you money. You can use the money to buy better guns and anything to defend your house. The game would be harder as you move from one level to another.