Quadrant Commander Coordinate Grid
Shoot the alien ships and mines attacking your coordinate by guiding your missiles to the correct coordinate. 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.