The strategy classic is currently 80% off on Steam and costs just $1.99. 4 Reviews ← exclude selected types ← exclude selected tagsIn Darkest Hour: A Hearts of Iron Game, players are given the first half of the 20th century as their strategic playground. Unlike the much newer Hearts of Iron IV, its historical scope stretches from the Russo-Japanese War and World War I through World War II and into the beginning of the Cold War. Until August 17, Darkest Hour is available on Steam at an 80% discount for $1.99 instead of $9.99. Darkest Hour was developed by experienced modders from the Paradox community based on Hearts of Iron II: Armageddon.