"Victoria – An Empire Under the Sun" was hailed by some critics as the
ultimate World Domination and Empire-Building simulation. The new
expansion is in a similar vein while offering several new and exciting
features. Among other things, players can continue their Victoria:
Revolutions games in HoI2 Doomsday, thus extending the gameplay for
both games.

Game features :

* 15 extra years of game play. Lead your nation through the challenging interwar period!
* An expanded tech tree to cover the interwar period, including aircrafts and carriers.
* A DOOMSDAY converter which allows players to continue their game in “Hearts of Iron 2: Doomsday”.
* A revamped election and politics system, adding a new level of realism to the game.
* An overhauled military system, which will be linked with the player’s policy decisions.
* A new economic system that brings more realism through various economic models.