In Lego Star Wars The Video Game what's behind the mystery door?
to open the '?' door in dexters diner you need to get the superkit piece from every other level and then the door is unlocked and you can play the tantive IV level. in story you play as the stormtrooper and Darth Vader and have to find princess leia. it is the easiest level in the game and once you beat it you can buy the rebel trooper and princess leia from dexter.