Free prologue for the post-apocalyptic strategy Infection Free Zone. A dangerous virus has spread throughout the world at the speed of jet planes. The infected are very aggressive, fast and strong. Within a couple of weeks, society collapsed and cities were deserted. There is no electricity, no water, no food. And yet there are a few survivors. Players are faced with the first days after the survivors have emerged to the surface. To survive, you need to collect resources, search buildings and create a fortified Zone that can stop the horde attacks at night.