Global Defense is a Massive Multiplayer Online space defender game. Start a game as single player and destroy the asteroids approaching the planet.
If your device is equipped with a gyroscope, the gyrotargeting system will be your primary aiming mechanism. Rotate the device left and right to aim, tap to fire. No gyroscope? Use ancient mouse pointer technology to aim.
You will need help to save the planet. Players can join your game by entering the Planetary ID found beneath the ship on the Heads Up Display.