LEGO Star Wars II: The Original Trilogy/Episode IV: A New Hope

Once in the episode 4 area, you will see multiple doors. Only one can be accessed so go in there.

Secret Plans
This is the first area. If you are embarassed to play as a girl you can switch to captain Antilles. Either way, you will see a bunch of lego pieces on the floor shaking. Press and hold the build button to pick them up and build two switches. Pull one of the switches and your partner will pull the other one. Head into the next room.