Around Day 30, the difficulty spikes. NPC factions like "The Cleaners" appear. They do not try to kill you; they try to you for experiments.
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: Always return items to the supply bin inside your home base to ensure you have materials for future upgrades. Family Meals Around Day 30, the difficulty spikes
: Zombies are active during the day and grow stronger over time. In urban areas, be cautious on rooftops; zombies can follow you up ladders. Development Status Around Day 30