Audition Online (Audition, Audi or X-Beat in Japan) is a multiplayer online casual rhythm game produced by T3 Entertainment, a Korean company. The game was originally distributed in North America by Nexon, but in 2009, announced they would not be renewing their license. Since then, the game has been distributed by Red Bana. The game has multiple modes. Choreography - C - 4 Key is easily the most popular mode, in which players must hit a certain number of arrow keys in the correct order and then press the space bar on beat.