Going under the name Scribblenauts Remix, I hear that this game is a port of Scribblenauts 2 from the DS which means that aside from nouns, you can create even crazier things by combining nouns with adjectives. Aside from all that, the game boasts that it has 10 new levels exclusive to the iOS versions.
The game is going for $4.99 in the app store. So what are you waiting for? Get the game and type in "Cthulu"! :D