A free program for Android, by Ozuma.

The World Has Gone is a survival strategy game that will test your survival skills in a post-apocalyptic world. You must lead a team of survivors in their quest to find food, shelter, and any other valuable resources to survive. 

You must build a strong base to protect yourself from the onslaught of zombies. You will be able to defend yourself with strong walls, firearms, and other weapons. You will have to fight against hordes of zombies, which can sometimes be very difficult.

You will need to gather resources, such as wood, metal, and power, to upgrade your base defenses. You can find these resources on missions.

The game will allow you to customize your characters and your missions.