Play Dance Dance Revolution Online

I want to play this game online but I want to know where? But I do not want to buy.

If you download the game ready to play Audition. The game is just freaking awesome. You can dance with or against others around North America. Make sure you live in North America, but because for this game, you need a North American IP address, or you can not enter
Here is the site for this:

http://www.audition.nexon.net/