Ensemble Studios Online 2 (also known as ESO) is the matchmaking service included in Age of Empires III and its expansions: the The WarChiefs and The Asian Dynasties. ESO features a quickmatch option, where players are randomly sorted into games. Players can also create games and playing in a game of their choice in the Game Browser. On ESO, players are ranked on their skill level. The Ranks are as follows: