When you complete Levels in Scribblenauts, type in new Objects, or achieve different Merits, you will earn Ollars. These Ollars can be used to unlock Level Packs on the map screen, or be taken to the Scribblenauts Store where you can purchase New Avatars and New Music.

Level Packs - New levels in Scribblenauts are unlocked using Ollars on the map screen. The first two packs, including the tutorial pack, are unlocked automatically when you start a new game. The most expensive of the level packs costs 25,000 Ollars.

Scribblenauts Avatars - If you ever get tired of looking at Maxwell, you can quickly slip on a new identity by buying an avatar. The Avatars in the game are: Alien, Witch, Zombie, DJ, Pirate, Bride, Ninja, Robot, and Shaman. There also seems to be another "secret" avatar, as the tenth avatar is not immediately available for purchase, but there is a spot for one more in the avatar selection screen. The Avatars are simply for show, they DO NOT give additional abilities in the game.

Scribblenauts Music - The Scribblenauts Store will let you pick up some of the in game music. The music can be listened to in the music player in the settings menu, and they can also be able to be used in Level Editor levels.