Empire Earth II is a real-time strategy video game developed by Mad Doc Software and published by Vivendi Universal Games and their subsidiary Sierra Entertainment on April 26, 2005. It is a sequel to Empire Earth, which was developed by the now-defunct Stainless Steel Studios. The game features 15 epochs, 14 different civilizations and has three playable campaigns: a Korean, German, and American one, as well as several other playable scenarios. The game received a positive reaction, earning a 79% average rating on GameRankings. Gameplay Empire Earth II has several new gameplay features from the original gameplay of Empire Earth, such as the Picture-in-Picture window, a small window within the game interface which allows the player to control activities such as unit and building construction. The Citizen Manager can be configured to tell a citizen what to do if they have no set task, and the Diplomacy System allows the player to make tributes and manage alliances and wars with other players. The War Planner is another new addition, which is a map of the game that the player can display and use to coordinate attacks with allies. The crown system grants strategic bonuses to players who are first to master an epoch's military, economic, or imperial paths at the cost of losing a faster age progression. Weather, another new feature, changes over time on the map and affects the look of the map and performance of units and, in the case of airplanes in thunderstorms, hit points. Besides campaigns and special scenarios, there is also a skirmish mode where the player can play against a computer player. The player can also play against other human players, however, the common EULA clause that each player needs his own copy of the game is actually enforced, even for LAN games. Unlike campaigns or scenarios, the winning conditions never change. There are eight different game modes in skirmish mode, which can also be played in Multiplayer. There are 15 epochs in the game, each representing a part of history. As the player advances through the epochs, new and improved units and structures become available. Some of the epochs in Empire Earth II are identical to their counterparts in the original Empire Earth—one exception is that Empire Earth II does not allow players to expand their empires into space. The epochs are the Stone Age, Copper Age, Bronze Age, Iron Age, Dark Ages,