you follow the moves,on the bottom right corner and if there are none,you mimic the dancer on screen.
I don't think that you can play Just Dance 2 Online.
well, you can go on youtube and look up some Just Dance 2 songs, make it full screen, and copy the dancer, but of course you won't get a score.
what songs from just dance are on just dance 2
Dance 2 and dance central are kinda alike. Dance 2 you only move your hand.