At twelve o'clock at midnight, the city was shrouded in an invisible layer of fog. After those who have been busy during the day fall asleep, another group of people will receive a gold-plated and black-edged invitation - no sender, only a line of handwritten words:
> "Welcome to tonight's survival game."
Anyone who receives the invitation letter, no matter where they are, will be forcibly pulled into a different space called "Midnight Mansion". This is an ancient building that never ends, and each floor is a different copy of the horror. Only by completing the task before dawn can we return to reality alive.
Worldview rules
The invitation cannot be refused: you must go to the appointment after receiving it, and those who escape will die mysteriously in the original world.
The mansion is refreshed every night: dungeons are randomly generated. Old buildings, hospitals, theaters, schools, trains, ancient villages... Can all become hunting grounds that night.
There are three levels of tasks: ordinary tasks, hidden tasks, and core tasks. The higher the level of completion, the more "Night Coins" you get, which can be exchanged for clues, props, or even the lives of others.
There is a "senior night crawler": those who survive for seven consecutive nights will be marked by the mansion and have a special identity, but they will also face more cruel copies.
Death is not the end: people who die in the mansion will become "NPCs" or "predators" and continue to wander around various dungeons, retaining some memories of their lives.
