: A new mechanic allowing nations to license military technology from more advanced powers or sell their own designs for a profit.

: New impassable terrain, such as the Sahara Desert, changed how warfare is conducted in North Africa.

The free 1.4 update, which accompanied the DLC, brought several major base-game overhauls:

The country pack for Hearts of Iron IV , released alongside the 1.4 "Oak" patch , focuses on the nations caught between the competing ambitions of Nazi Germany and the Soviet Union. Version 1.4.2 was a follow-up stability update that refined the mechanics introduced in this expansion. Key Features of Death or Dishonor

: Adjustments were made to how nations surrender, including the ability to stop a capitulation by reclaiming enough territory and the capital. Critical Reception

: A complete redesign of the air combat interface, mission selection, and wing management on the map.

This pack introduces content primarily for Central European and Balkan "minor" powers.