Maxwell had to go through many puzzles, solving them one by one.
He was being taught by The Professor until one day it was time to go out and train. He needs the Starites to compete the level. After beating the game, Maxwell becomes a Super Scribblenaut.
Maxwell now can use a bigger vocabulary plus the advantage of using adjectives to create nearly anything. It ends with Maxwell, beating a doppleganger(an evil version of Maxwell) as the last level. After he beats the game, he becomes a better Super Scribblenaut.
In this game, Maxwell needed to save his sister Lily from being turned into stone. In this game, he has a near infinite amount of characters that can be created, due to the Object Editor and the expanded list of abilities