Missile Defense 3D is a light gun game where you control a missile defense system, tasked with protecting cities from incoming missiles. The story revolves around the protagonist's mission to defend major cities from destruction, using a variety of missiles and defense systems.
The gameplay involves navigating a 2D arena while targeting incoming missiles. Players must use their accuracy and timing to destroy the missiles before they reach the city, all while avoiding enemy fire and obstacles. The game requires quick reflexes and strategic thinking, as players must adapt to changing situations and prioritize targets.