About Darkest Hour: A Hearts of Iron Gameĭarkest Hour: A Hearts of Iron Game is a grand strategy wargame that is based on Paradox Interactive’s Europa engine.Darkest Hour Full provides different grand campaign scenarios (where it is possible to choose any of the nations involved) or battlescenarios (focused on single theaters of operations, with only a few nations involved and playable).The player can build land divisions, aircraft fleets, and naval ships/fleets, and combine these into corps and armies. Download Darkest Hour: A Hearts of Iron Game for free on PC – this page will show you how to download and install the full version of Darkest Hour: A Hearts of Iron Game on PC.