I've been playing Audition Online Dance Battle for a year and from this experience, it's been the best game I have ever played!
You can meet new friends, listen to new and different songs in different languages and, some in English too!
This game is a dancing styled game. You have these digital characters which are yours, you can buy things in both digital money and real cash to customize your character, anyways then these characters can dance!
Of course, you have to play to get these characters to dance. There are arrow keys listed in the middle of the screen, you simply press them in the order given and then press space, your character will start to dance.
I know it's sounds really boring and child-ish when I'm writing this out but, that's what I thought the first time when my friend introduced Audition to me.
Really, go play it! You'll love it! Well, maybe not as much as me but, still!