You are leading a mission to destroy Dr. Destructo’s array of ships, and
ultimately his island hideout, over 21 levels. You do this by flying a plane
over a limited area, and shooting his planes so that they fall and inflict
damage on the target item, which is large at the bottom of the screen.
Multiple shots on a particular spot will ultimately cause a water-spout; three
waterspouts and the ship (or island) will sink.

Some enemy beings can be shot down, but others are indestructible and require
evasive action. You are also armed with a bomb, which can be used to inflict
precise damage once per level. One of the features of this game is that it
uses a day/night cycle.