The dungeon scenario was still a building, but this time it was a 32-story hotel, with elevators now available for use.
Main dungeon quest: Rescue NPCs. There were still many uninfected humans in the hotel, who needed to be taken to the hotel rooftop where a bonfire would be lit, signaling a helicopter to pick them up. To complete the dungeon, first, 50 NPCs had to be evacuated, then the final dungeon boss would appear. Defeating the boss meant clearing the dungeon.
NPCs were hidden in every corner of the hotel, and they were safe. Only after the players discovered them could they possibly be attacked. Put simply, the zombies ignored them until the players found them.
Only Hell mode had main quests.