This 2003 expansion for Civilization III deepens the turn-based strategy core by adding eight new civilizations, bringing the total playable count to thirty-one. Gameplay is enhanced with two new government types (Feudalism and Fascism), new Wonders, and two new civilization traits (seafaring and agricultural). The world map features new resources and terrain, including hazardous volcanoes and disease-prone marshes. Its centerpiece is the introduction of focused historical scenarios, offering shorter, alternative challenges that integrate directly with the base game experience.
To support these new cultures and refine existing ones, two new special traits have been implemented: seafaring and agricultural. These traits are leveraged by the new civilizations—for example, the Sumerians are designated as Scientific and Agricultural—while some original civilizations have been updated to better reflect historical strengths.
Furthermore, the political landscape is broadened with the introduction of two new forms of government: Feudalism and Fascism. Players can also strive to build new Wonders of the World, such as the Statue of Zeus and the Mausoleum of Mausollos.
Four new bonus resources have been added, two of which offer food bonuses to previously less desirable terrain types. These include Oases in deserts, tropical fruit in jungles, sugar on plains and hills, and tobacco on grasslands and hills.
Two new terrain types are also present: marshes and volcanoes. Cities cannot be founded on marshes, and citizens working a marsh tile risk disease. Volcanoes present a dynamic hazard, capable of erupting periodically to destroy adjacent improvements, cities, and units.
This content is generally regarded as a substantial enhancement to the original game, adding significant replayability through its diverse new cultures and focused scenario modes.