Age of Empires Online features some of the gameplay of past games in the series, with the addition of a persistent city that functions when the player is offline, cooperative multiplayer quests, and trading. The game is an attempt to blend the real-time strategy (RTS) genre with massively multiplayer online gaming. Also, the game features a great quantity of new content, such as crafting items with earned materials.Playable civilizations include the Greeks, Egyptians, and Celts (to be released on March 2012), plus the Persian civilization that is currently only available to users who purchase the premium package.