In terms of open-world zombie games, there have been a few. Before it there was Dead Island, DayZ and ZombiU, all of which captured at least some elements required. Step forth State of Decay. With fresh ideas and a long history of culture to build off of, State of Decay has done well for itself. While survival is often a part of these games, it usually isn’t the main focus. State of Decay implements survival as mechanics where you must scavenge for food, medicine and weapons to keep you and your fellow survivors alive. In order to do this, the main focus of the game has been set around a home base which you can upgrade with items you’ll go out scavenging for. Scavenging also has a lot of the focus as it is essential to maintaining and upgrading your base. As important as a base is, it’s almost as important to strategically place outposts to help thin out the hordes of zombies and give you temporary respite.