Explosive barrels dropping from large pipe chunks, thunderstorm, and sharks!

Wait for the island to be destroyed by the explosive. Place an immovable object beneath the large pipe chunks to prevent barrels from fallen. Place an object on the green button at the bottom of the water to lift the green gate. Fly to the starite with a flying device. You might get electrocuted by the thunder at the end, but its not going to kill you.

Round 1:
Immovable Invincible Platform
Rock
Flying Shoe

Round 2:
Immovable Invincible Sofa
Stone
Talaria

Round 3:
Immovable Invincible Table
Heavy Box
Wings

Scribblenauts Remix 15-3 Cheats Hints gallery:
15-3-1-a: Navigate the elements to the Starite!
15-3-1-b: A heavy object can keep the button pressed.
15-3-1-c: Maxwell will need to fly to reach the Starite.