The amazingly large world map of Earth circa 1936 is made up of over 11,000 unique provinces, sea regions, and air zones. The payoff is brilliant for those willing to put in the time to learn. Thanks to an unusually striking look and clean, easily navigable interface, the biggest challenges we Hearts of Iron 4 presents us with are the good kind: strategic planning, division composition, and fine-tuning economic and political policies. And as someone eager to invest that kind of time into a game as long as it continues to reward me with new layers of depth, I consider that a very good thing. Hearts of Iron 4 is an incredibly complex World War II simulation that will require potentially hundreds of hours to master, both in-game and poring over wiki articles that read like an economics textbook.