Unlockable Anakin's Flight
When you are in the bonus room(The door with the ? marking.) you will see a door that says that you need more gold bricks to build the door you can collect gold bricks from buying them in the cantina or anywhere else throughout your journey. Once you have enough you can build the doorway. Lastly when you finish the level it will give you a Gold Brick and a Naboo Starfighter as a prize!