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Darkest Hour is a stand-alone Hearts of Iron game. This game features a mixture of short and in-depth campaigns set across the darkest chapters of the 20th century. You play from the outbreak of the Great War up until the onset of the Cold War. Darkest Hour has an artificial intelligence that is able to react to hundreds of different situations simultaneously. It implements a dynamic diplomatic system that will allow the player to have a real impact on the course of history.