The selected player becomes a "night watcher". Everything is normal in the city during the day, but from 2:00 to 4:00 every night, a non-existent "Thirteenth Floor" will appear in the city. The night watchers must enter the thirteenth floor and deal with various realities distorted by "information pollution". Weird stories spread through social media, urban legends, forgotten surveillance footage—the more people who believe them, the more real they become.
