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In Earth Defense, aliens have invaded Earth. In response, the United Nations create a flying craft named the "Phoenix Spitfire" to fight back and defend the planet, with the player in control.

The player will fly through five vertically-scrolling levels while shooting down enemy craft, confronting a boss at the end of each level. The Phoenix Spitfire is equipped with a standard cannon that can be upgraded by finding power-ups throughout the levels, left behind by defeated enemies. Upgrades to the cannon include the Tri-Shot, Napalm Bomb, Rear Shots, and support drones.