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the player takes control of an unnamed starship from the Interstellar Space Force with a mission to prevent the iron-fisted Empire of GORF from conquering Earth. The ship is capable of moving freely in all directions around the lower third of the screen under the control of a joystick. This was a departure from older vertically oriented linear shooters, including Space Invaders and Galaxian, which allowed only horizontal movement of the player's ship controlled by left and right buttons. At the time, the joystick

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