Board Thread:Level Sharing and Reviewing/@comment-41.13.228.247-20140928185417/@comment-5645428-20140929032735

If you've beaten Clubstep on practice mode, you would have gotten the black colour which gives the icon an outline of the other colour you've selected. The "secret" also does that, as well as giving the icon a rainbow trail when it moves a lot. Good for you, it's only 10 map packs too.