"Old God Cinema Line" is a full-length horror novel with rules and ghost stories deeply integrated into the essence of the Cthulhu mythology. The story is set in a strange midnight cinema, constructing a logically rigorous and progressive cage of despair. Different from the traditional strange stories about rules, this game upgrades the "rules" themselves to the cognitive pollution unconsciously emitted by external gods, and all struggles and resistances are woven into deeper traps.