In Biplane Bomber II, you start of with a biplane, mounted with a puny caliber gun and a handful of bombs. As you fight your way through the levels in different landscapes and environments you gain points which can be used to purchase any of the 13 upgrades - such as a fast firing, high caliber gun or a plane with a rear gunner sitting behind you. All sound effects are purchased from soundrangers.com, the game contains no copyright protected material.