Tip 1: It'ses a good idea to planning ahead. What parts do you contend your disposal? Where are the star boxes found? Are you thinking about gathering them the very first time around, or are you much better off moving and clearing a stage on?
Tip 2: It's safe to presume they'll come into play in some way if a stage opens with parts currently in place. While all parts require to work together in order to get all the stars in a stage, not all of them are required to merely clear the stage.