Long Gone Days takes place on Earth in the fictional country of the Core with an unknown location. Each resident of this place is trained in a certain job from birth. When people become adults, they are already qualified as an expert in their field. The player follows Rourke, a military sniper who has never been to the rest of the world or the surface. The central character receives a new task, during which he goes to help the Polish troops in Kaliningrad. The gameplay is presented in the form of a role-playing adventure with turn-based battles. In shootouts, the user is able to choose which part of the body to hit the opponent. The morality system increases or decreases, depending on the choices and actions of the gamer during dialogues, battles or solving problems.