"Age of Empires (often abbreviated to AoE), is a history-based real-time strategy computer game released in 1997. Developed by Ensemble Studios and published by Microsoft, the game uses the Genie, a 2D sprite based game engine. The game allows the user to act as the leader of an ancient civilization by advancing it through four ages, (Stone Age, Tool Age, Bronze Age, and Iron Age) gaining access to new and improved units with each advance." Source: Wikipedia, "Age_of_Empires_(video_game)," available under the CC-BY-SA License.