Gameplay: 

Hearts of Iron IV is a grand strategy wargame that primarily revolves around World War II. The player may play as any nation in the world in the 1936 or 1939 start dates in singleplayer or multiplayers, although the game is not designed to go beyond 1950. A nation's military is divided between naval forces, aerial forces, and ground forces. For the ground forces, the player may train, customize, and command divisions consisting of various types of infantry, tanks, and other units. These divisions require equipment and manpower to fight properly. The navy and air force also require men and equipment, including the actual warships and warplanes that are used in combat. Equipment is produced by military factories, while ships are built by dockyards. These military factories and dockyards are, in turn, constructed by civilian factories, which also construct a variety of other buildings, produce consumer goods for the civilian population, and oversee commerce with other nations.