1) each player set his/hers submarines (which comes in sizes) on a board.
2) each player in his/hers turn, aim at a certain location on the opponents board and shoot - each shot has a consequence:
miss - no damage was inflicted on the opponent hit - a part of one of the opponent's submarines was hit strike - one of the opponent's submarines was fully hit and has sunk. 3) the opponent does the same and so on till one of the player has sunk all of the opponent's submarines.