Star Wars Disco
In Episode II Chapter I After you get to Jango Fett's room go across the hall and enter the other room. Inside you will find a large set of switchs. Useing R4 and yourself light all of the floor panels to start the Star Wars disco. The floor will turn into a disco mat and a techno version of the Star Wars theme song will start playing, also the Kamino's will start dancing.
Unlocking the "?" door
To unlock the "?" door found at the episode selection room, you must achieve True Jedi Status in all of the seventeen levels, 6 in Episode 1, 5 in Episode 2, and 6 in Episode 3. True Jedi Status is the black/golden bar that appears at the top of your screen during any episode level. The way to fill up this bar is by getting a certain amount of studs during that level (each lvl has a different required stud amount.) Once all levels have True Jedi Status, the "?" door will be unlocked.
Codes for Dex's Diner
To enter these codes go to Dexter's Diner and go to the category "Codes"
Unlockable Characters from the ? Door
When you reach True Jedi Status in all 17 levels, the ? door opensin Dexter's Diner. Finish the mission for the following unlockables.
Darth Vader - Complete the mission behind the ? Door
Stormtrooper - Complete the mission behind the ? Door
Buy Princess Leia from Dexter - Complete the mission behind the ? Door
Buy Rebel Soldier from Dexter - Complete the mission behind the ? Door