Contains: Sabaton Soundtrack, Together for Victory 2 more expansions to come. Hearts of Iron IV Expansion Pass is delivered as Steam cd key after your purchase. Hearts of Iron IV Expansion Pass installation is done entirely on Steam. Internet connection is required. Victory is at your fingertips! Your ability to lead your nation is your supreme weapon, the strategy game Hearts of Iron IV lets you take command of any nation in World War II; the most engaging conflict in world history.