GTA: The Last Stand
When the zombie Apocalypse happened, no one was prepared and much of the population were erased. Now, only a few survivors are left and it would be safer to bond together than to live alone. Fortunately, you are one of the few survivors and you are able to create a barricade, but that won't hold the zombies out much long. You would need some allies to take them on. You need to defend your barricade against these zombies. Repair your barricade, find other survivors and look for powerful weapons. The game gets harder and harder as you make some progress, so you really need allies and powerful weapons.