0ad: 0ad (RTS Game of Ancient Warfare) 0ad: 0ad: 0 A.D. (pronounced "zero ey-dee") is a free, open-source, cross- 0ad: platform real-time strategy (RTS) game of ancient warfare. In short, 0ad: it is a historically-based war/economy game that allows players to 0ad: relive or rewrite the history of Western civilizations, focusing on 0ad: the years between 500 B.C. and 500 A.D. The project is highly 0ad: ambitious, involving state-of-the-art 3D graphics, detailed artwork, 0ad: sound, and a flexible and powerful custom-built game engine. 0ad: 0ad: https://play0ad.com/