Day of the Shell introduces the player to a ruined, flooded world where survival depends on quick decision-making and the careful management of limited resources. The events take place on a chain of islands, each of which offers unique challenges that test strategic skills and quick reactions. The arsenal includes a limited number of weapons, including a revolver, which helps to overcome various threats. Interaction with higher powers plays an important role, requiring not only confrontation, but also establishing a balance to achieve goals.