As always, our passion and determination to give you the best Fallout strategy experience possible remains strong. Old World Blues is the definitive Fallout experience for Hearts of Iron IV, a total overhaul that uses its expansive list of changes to make the game a truly new and unforgettable experience. Forty seven national focus trees-ten of which are generic-keep the game exciting as numerous powers contest in a battle to control the Wasteland. Experience the postapocalypse like never before with a dynamic war system that ensures that the AI nations act on their own, respond to aggression, and strike when their opponents are weak. Last revision: 11 Apr at UTC File size: 1.