The youngest player begins. Take turns to "shoot" at the enemy's fleet by calling out the number of a certain box by its grid location. For example, you could call out "B4" or "D1". Your enemy must say whether the shot is a "miss" or a "hit", and, if it's a "hit", you can keep track of what you have shot on your lower grid (for a "hit" use the red magnet and if it's a "miss", use a black magnet). If you have a successful hit, you have another turn, and can continue hitting until you miss. Play continues until one player wins by successfully sinking the whole of the other player's fleet.