O2Jam is an online rhythm game developed in South Korea by O2Media. At present there are agencies in many countries and regions. It is similar to Beatmania IIDX in its interface, and shares many similarities with another music game, VOS, an abbreviation from Virtual Orchestra Studio.

Playing the game is divided between finding a room to play in, selecting a song, and playing a song. There are 3 servers in the Korean version of O2Jam, technically called Music-Halls: Melpomin, Kalliope and Kleo. All 3 servers are named after the Muses in Greek mythology.

In the Malaysian version of O2Jam, there are also three servers: Kalliope, Kleo and Thalia. All three are free to use, although about half of the songs cost money to play. Each server works under song level restrictions. Before Thalia was introduced, in Kalliope, only songs level 15 and below could be played, while Kleo allowed all songs above level 13. As of 09/08/06, the Malaysian version of O2Jam has all three servers: Kalliope, which is now a level 1-13 song restriction, Thalia, a level 7-19 restriction, and Kleo, which remains the same.

In the Philippines Version, there are six Free-2-Play Forever servers. These are Euta, Thalo, Kalliope, Melpomin, Kleo and Philix. Euta and Kleo serve as the Philippine's main servers while Thalo, Kalliope, Melpomin, and Philix serve as temporary emergency servers, mostly used when Euta and Kleo are on stabilization and maintenance. Euta and Kleo covers almost 70% of the player population, while Thalo, Kalliope, Melpomin and Philix cover 30%.


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