HELLMART is a first-person survival simulator in which the routine work of a supermarket employee turns into a living nightmare after dark. The night shift becomes a test of endurance, as not only late shoppers but also supernatural entities skillfully imitating the appearance of ordinary people gather behind the store's doors. The protagonist's fate depends entirely on their ability to recognize disguised evil, based on subtle distortions in appearance or odd behavior. A mistake in this choice can prove fatal, and the maze of tall shelves becomes the last chance for shelter or escape.