Start by arranging all your ships on the map. In each turn, click on the grid in order to detect and blow your rival's ships. You'll have 3 special weapons available: a self-directed missile that is programmed to attack your rival's ships, a missile rain that can blow 9 squares in a single turn and an air attack that destroys a complete row. It's game over when one of the players sinks their rival's fleet.
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