Developed by a team of experienced modders from the Paradox forum, Darkest Hour is a stand-alone Hearts of Iron game featuring a mixture of short and in-depth campaigns set across the darkest chapters of the 20th century, from the outbreak of the Great War up to the onset of the Cold War. Darkest Hour will introduce a new artificial intelligence that is now able to react to hundreds of different situations simultaneously, along with a dynamic diplomatic system that will allow the player to have a real impact on the course of history. There are no refunds for this item. Digital Rights Management Disclosure. This software uses digital rights management software (“DRM”). DRM may limit the number of times you are permitted to install this software on a computer and/or the number of computers to which you may install the software. To function properly, DRM downloads certain data and files to your computer, which may or may not be uninstalled when you uninstall the software.