Welcome to 25920! The distance from the lowest submarine to the highest airplane (In America units of course).
Your goal is to destroy the enemy craft before they do the same to you. Whoever loses all Submarines OR Boats OR Planes first loses the game.
Play against the computer or locally with a friend. Can you beat Alexander the great if Alexander had battleships? Can you beat your snot nosed cousin after family dinner? (Probably that kid is an idiot)