0 A.D. is a free, open-source, cross-platform real-time strategy (RTS) game of ancient warfare. It's a historically-based war/economy game that allows players to relive or rewrite the history of six ancient Western civilizations, from Iberia to Persia, each depicted at their peak of economic growth and military prowess. Developed using Pyrogenesis, a ground-breaking new game engine custom-built to suit this project, 0 A.D. will give players a rich and entertaining real-time gaming experience.
New features in 0 A.D. Alpha 12 include Diplomacy, Packing Siege Engines, Formation Order Queueing, New Maps, Improved Water Rendering, Rubble, Post-Processing Manager and lots more. Wind simulation was added in Alpha 11 but was added to more trees for Alpha 12.