Europa Universalis III – Heir to the Throne requires the original Europa Universalis III game and the previous two expansions in order to play. Requested by the fans, Heir to the Throne is the third expansion to the preeminent historical strategy game Europa Universalis III. The expansion takes the hugely successful game beyond complete, with improvements across the board. 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.