For example, submarines were not hindered by enemy naval units, and could run a blockade by moving two spaces right through an enemy fleet. Also, neutrals were more of a factor, like Spain, although a neutral, contributed 3 to the German economy. Most neutrals also had an economic value. For weapons development, the current Heavy Bombers was originally the Atomic Bomb. And the Nova version also had kamikaze attacks for the Japanese, moveable Russion factories, US Marines, the British Home Guard, and German SS Panzerkorps.
Players control Britain, USA, Russia, Japan and Germany.