As captain of the Sonic Spaceport, players must defend their station against enemy spaceships called Gamma Raiders, which attack with vengeance and swiftly retreat to formation. The object of the game is to destroy 48 enemy Gamma Raiders before the total disintegration of all of the player's Spaceports.

As captain of the Sonic Spaceport, players must defend their station against enemy spaceships called Gamma Raiders, which attack with vengeance and swiftly retreat to formation. The object of the game is to destroy 48 enemy Gamma Raiders before the total disintegration of all of the player's Spaceports.