just thought that it would be a good idea to tell everyone before I get repremended again. Well, here is the explanation:
Okay, before you hit the switch that turns the castle upside down, have Cream be the leader. Hit the switch and let the castle flip. Once it has, fly to the curtain that blocks you from the extra part of the stage that you can't go to. It doesn't work. ^.^ On the rail is 5 more rings, but that's it.