0 A D Alpha 21 Ulysses Released Available PPA For Ubuntu Derivatives 0 A.D. Alpha 21 �Ulysses� release with New MAP. This alpha features new game modes, plenty of new maps, the official introduction of the final civilization: The Seleucid Empire and more! 0 A.D. is an open source and cross-platform historical game that lets players to rewrite the history of Western civilizations. It is a war and economy RTS (Real-time Strategy) game where the entire action takes place between 500 B.C. and 500 A.D.. See the video release : Features at a glance Key features include both single-player and multiplayer gameplay, basic RTS elements, including base building, army training, technology research and combat, support for multiple buildings and units, as well as support for both naval and land units. The multiplayer component of the game does not require a central server and uses the peer-to-peer (P2P) networking technology. It was initially designed as a total conversion mod for the Age of Empire...