Actually, this is the minikit you can only get by blowing up some boulders on the right a ways before getting to this point. There is a canyon you need to fly over with R2D2, and this will take you into a secret area. This can only be done in Free Play. Once you get to the end of the secret area, there are three bad guys there. Kill them, and then turn into R2D2. You can the fly across and get ths minikit.