Zelter places you right in the midst of a fast-spreading zombie outbreak that has isolated entire communities. In this dangerous setting, you take on the role of a courageous survivor who has been dropped into a quarantined city overrun by former humans turned monsters. Instead of charging in recklessly, you'll need to explore the ruins, gather essential resources, and use them to build and upgrade your shelter. Begin with makeshift stone spears and work your way up to more advanced firearms, all while foraging and hunting just enough to keep hunger and thirst at bay.