U must have an abstract enemy base class with at least three subclasses of the enemy class; these classes must implement a move and an attack method specific to their behavior. You must have a weapon class with at least three subclasses of the weapon class; these classes must implement a use method specific to their behavior. Next, you need: A set of enemies. This collection should be polymorphic. A set of weapons. This collection should also be polymorphic. This set of weapons should represent the weapons lying about on the ground of the world. So their position should represent their X/Y/Z coordinates in the world.