Darkest Hour: A Hearts of Iron Game

Developed by a team of experienced modders from the Paradox forum, Darkest Hour is a stand-alone Hearts of Iron game. The game features a mixture of short and in-depth campaigns set across the darkest chapters of the 20th century. Play from the outbreak of the Great War up until the onset of the Cold War.

https://store.steampowered.com/app/73170/Darkest_Hour_A_Hearts_of_Iron_Game/