Mode: Battle Enemies
Enemies: Clone, Battle Droid
Get in a center area, where you have a few bridges leading to you. Walk across those bridges briefly, and then return to the center, drawing in enemies from all sides.
Mode: Collect Studs
Mode: Stud Hunt
Hunt: 362,000 studs
Far on the right side, on the platform where you have to grapple across to reach, there are a lot of purple studs