"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.".Victoria Revolutions requires the original game "Victoria – An Empire Under the Sun"New features of “Victoria – Revolutions” include: • 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 is linked with the player’s policy decisions. • A new economic system that brings more realism through various economic models.