Maxwell needs to feed the hungry penguin who is hungry for the smallest three. First, equip Maxwell to go in the water: scuba diving mask, oxygen tank, wet suit

Round 1: Scuba
Round 2: Oxygen Tank
Round 3: Wet Suit

Dive into the water and pick up the smallest three: Barreleye, Guppy, Blobfish
Bring them back and give to the penguin and win the Starlite.

Scribblenauts Remix 9-1 Cheats Hints gallery:
9-1-1-a: The penguin is hungry for the smallest three!
9-1-1-b: Maxwell needs something to help him swim below the surface of the water.
9-1-1-c: Give Maxwell flippers so that he can catch the fish.