Age of Empires Online is utilizing the Windows Games Live platform and it has persistent world, PvE and PvP contents. Like other RTS games, you will develop your army from a small troop to a large force, and build your town from a small tribe to strong empire. It's easy to create different units and build various buildings, but it requires a lot of practice and study if you want to master the every aspect of the game. So, the PvE contents will be helpful. Before you jump into the ruthless PvP battle, call upon your closest allies and unite against the AI foes for practice. You can finish many quests faster with your LIVE friends and reap the benefits of your alliances.