Classic Battleship with a twist: before the main game begins, both the player and his computer opponent get the opportunity to place eight sea mines. If a ship is placed over a grid cell which was mined by the other side, they score an immediate hit and get the additional advantage of already knowing the position of one of the enemy ships. Players get to shoot one more shell per round for each enemy ship they already sank; however, if they hit a mine it's the opponent's turn immediately.