Hearts of Iron II: Iron Cross is a comprehensive expansion for the strategy game Hearts of Iron II: Armageddon, released on October 7, 2010. This expansion introduces a wealth of new content, including a significantly enlarged map featuring over 4,000 new provinces and a plethora of new scenarios set in the years 1933 andPlayers can engage with a total of 200 countries, navigating historical events and interacting with real-world leaders and ministers from this pivotal era in history.

The expansion enhances gameplay with over 6,000 new events and a detailed tech tree featuring 800 new technologies. It introduces new units and brigades to diversify military strategies, alongside an improved AI that offers deeper gameplay options. Notably, Iron Cross is compatible with previous titles such as Hearts of Iron II: Armageddon, Arsenal of Democracy, and Darkest Hour, making it a versatile addition for strategy enthusiasts.