Empire Earth, also known as EE, is a real-time strategy computer game developed by Stainless Steel Studios and released on November 23, 2001. It is the first game in the Empire Earth series. It has been described as very similar to the Age of Empires series, and received positive reviews.
The game requires players to collect resources to construct buildings, produce citizens, and conquer opposing civilizations. Empire Earth spans 500,000 years of world history, which is divided into 14 epochs, beginning with the prehistoric age, and ending with the nano age.
An expansion pack was developed by Mad Doc Software called Empire Earth: The Art of Conquest, which was released on September 17, 2002. It added new features such as a special power for each civilization, and a new 15th epoch, entitled the Space Age, which focuses on the colonization of space planets.
Empire Earth is similar to the Age of Empires series in that it is a history-based real-time strategy game. Empire Earth uses 3D graphics instead of sprites like Age of Empires II, the comparable game at the time. The game itself contains many unique and innovative features, including a well implemented "morale" system, which directly affects individual units statistics. It also incorporates a "hero" system. Heroes can be built at the town centre or capital. There are two types of heroes, Strategist heroes who heal surrounding units and can demoralize enemy units while Warrior heroes give morale to surrounding units and have a greater attack power. Finally, the player has the option of creating their own civilization with unique bonuses. Empire Earth has a map editor included.
Epochs are the ages a player passes through in Empire Earth. Each of these epochs represents an age within history. In Empire Earth, the last two ages (Digital and Nano Ages) are set into the moderate future. In the Art of Conquest, a third future age, the Space Age, is available. It deals with space colonization. Each epoch brings new technologies and units. Epoch advancement requires additional buildings to be built and the costs of advancing increases as more epochs are attained, although the ability to gather the required resources greatly increases as well. With new epochs, some new units are available at the cost of having to abandon the ability to produce old units, though any old units still alive are kept. The epochs in Empire Earth are the Prehistoric Age, the Stone Age, the Copper Age, the Bronze age, the Dark Age, the Middle Ages, the Renaissance, the Imperial age, the Industrial age, the Atomic World War I age, the Atomic World War II Age, the Atomic Modern Age, the Digital Age and the Nano Age. An extra epoch, the Space Age, is available in Empire Earth: The Art of Conquest.