Paradox Interactive's WWII grand strategy game Hearts of Iron IV is an amazing game whose immense depth is both its biggest draw and biggest challenge. In Hearts of Iron IV, players take control of any nation and lead them to victory in WWII by either following the course of history or creating an alternate history by changing their nation's government, military, and economy. With every major country having been overhauled, almost every major system in the game completely reworked, and new DLC on the way, there's never been a better time to try out HOI4.
Source：https://www.cbr.com/hearts-of-iron-iv-china-guide/
