This phrase refers to a specific puzzle clue found within the CodyCross game. It signifies a dwelling that is characterized by having only a single level or floor. A typical example of such a structure would be a ranch-style house, which is commonly built on a single story plan.
The popularity of this specific puzzle element stems from its simplicity and the common knowledge it requires. Solving it often provides players with a small sense of accomplishment. This type of architectural design has historical roots in various cultures, offering ease of access and often affordability, contributing to its widespread recognition.