Explore new maps, multiplayer scenarios, and user created campaigns. Or reinvent your game experience with new sounds, visuals, AI, units, and more! Ready to share your creations with the world? Upload right from the map editor, or collaborate with friends to create a masterpiece collection.
Out of sheer curiosity, what are the current limitations of content? Is it at all plausible to add bits and pieces of say, Age of Empires III (notably their "steam age" consisting of trains and the like).