Play Episode I: The Phantom Menace, Chapter 6: Darth Maul in Story mode or Free Play mode. Get to near the end of the chapter when you are taking down the red force fields. Finish the last force field, but do not follow Darth Maul. Instead, run back the way you came until you are in the previous room. Then, return to the force field room. Darth Maul will be in his first position, but all of the force fields are still down. You cannot hurt him; ignore him. Even though the force fields are down, the switches have reset. Hit all the switches again to gain more Studs. You can get at least 6,000 to 7,000 Studs with each pass. Repeat process as many times as desired.