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A strange heavy fog enveloped the city, and Lin Xiu found himself trapped in an apartment building governed by rules. The elevator buttons are messed up, floors disappear out of thin air, and those who violate the rules will die in the most horrific way. As a logical reasoning genius, Lin Xiu must solve puzzles one by one under the threat of death: - Why did the 14th floor disappear? - Where did the blood in the elevator come from? - Who is playing the piano that sounds late at night? - Why do all the clocks stop at 8:15? As the investigation deepened, Lin Xiu discovered that this apartment was related to an unsolved murder three years ago. What's even more frightening is that it doesn't seem like he has experienced this for the first time... In the twisted corridors of space and the puzzle of time loops, Lin Xiu must use his extraordinary wisdom to find the truth among rules and lies. Because only by solving the final puzzle can we escape from this maze of death. But when he finally touches the truth, an even more shocking discovery is waiting for him: perhaps, he is the initiator of all this...