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This is a unique variant of the battleship format featuring a three-dimensional game board. Players hide their submarines and a mine on one side's underwater levels while placing their surface ships on the upper surface level of the other side. They take turns moving a ship to a desired grid position and firing a water bomb to mark hits, near misses, and misses on the opponent's submarines. Submarines can fire torpedoes at surface ships in the same column, and the game continues until one player sinks all three opponent submarines or all surface ships, which rarely happens.