every one in lots of the threads talk about keys and not knowing what they do.well i think i got something here. the keys do not unlock doors but buttons on the controller.there is a code out there that conincides with the buttons on the controller.each key has a color .that in a way match up the colors in the controller.fact two the code in the guide also is part of it too .when u have all the keys and the right screen to do the code on then u should get something.as for the ninja star and others, well i havent figured that out yet.