Hearts of Iron III is a grand strategy game set during World War II where you control a nation's military, economy, and diplomacy. You manage production chains, deploy armies across a world map, and coordinate with or against other powers through the entire conflict. The espionage system lets you run covert operations and sabotage enemy nations from within. Battle plan mode supports drawing custom offensive strategies or loading historical operations, which you can share with allied players in multiplayer matches. Two scripted battle scenarios offer focused challenges, while a custom game mode drops you into specific situations without the full campaign buildup. It's dense with overlapping systems—production pipelines feed armies that execute plans you've drawn on a map while spies work behind enemy lines.
