Battleship: For my improved version of Battleship, I added one more marine vehicle and one more weapon type. These are a submarine and torpedoes. The original ships can be placed over the submarine except for the entrance hatch marked by a black spot on this model. At the beginning, each player has 5 torpedoes. Submarines can only be hit by torpedoes and ships by missiles, not the other way around. The only exception to this, is the entrance hatch of the submarine which can be hit by either ammunition but only once. A torpedo fires in a straight line, therefore the player only has to announce the column they want to target. If a submarine is hit on the nose/tail whilst placed vertically it is destroyed instantly. If a submarine is the last vehicle left, the player attacking it has unlimited torpedoes.
I have a video but it is too large!