You have to get the Starite by using the buttons and switches in the correct order. There is some dirt that you can dig through, just above where the yellow gate is. This makes it easier to get the starite.

1. Give Maxwell WINGS and a SHOVEL. Put a CRATE on the red button. Flip the orange switch, then the yellow switch. Fly up onto the blue button. Make sure that the Starite has fallen below the blue gate. Then go up and flip the orange switch. Then remove the crate from the red button. Flip the orange switch again. Then put the crate back onto the red switch. Finally, dig through the dirt and get the Starite.
2. Give Maxwell a JETPACK and a PICKAXE. Put a BOX on the red button. Flip the orange switch, then the yellow switch. Fly up onto the blue button. Make sure that the Starite has fallen below the blue gate. Then go up and flip the orange switch. Then remove the box from the red button. Flip the orange switch again. Then put the box back onto the red switch. Finally, dig through the dirt and get the Starite.
3. Give Maxwell a FLYING HELMET and a PICK (TOOL). Put a PIE on the red button. Flip the orange switch, then the yellow switch. Fly up onto the blue button. Make sure that the Starite has fallen below the blue gate. Then go up and flip the orange switch. Then remove the pie from the red button. Flip the orange switch again. Then put the pie back onto the red switch. Finally, dig through the dirt and get the Starite.