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Shoot the alien ships and mines attacking in your coordinate grid by guiding your missiles to the correct coordinate pair location. Choose to play on Quadrant 1 or all 4 Quadrants in timed or untimed mode.
Instructions are available in-game and can be accessed by clicking/tapping the Instructions button on the main menu. A video demo can also be viewed by clicking/tapping the "Video Overview" text at the bottom of the main menu.
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