Starites, are the main object, in the Scribblenauts series. They are used, as a reward, for the player.
In Scribblenauts, Starites are the reward, for completing a level. The player, will be given a task, and use their notebook to create something to complete it. It is unknown, why the Starites are important.
Super Scribblenauts Edit
Starites, are collected, to deafeat Maxwell's enemy The Dopleganger. The player, must look for enough starites, to deafeat The Dopleganger. Maxwell slings them at him, and deafeats him.
Scribblenauts Unlimited Edit
In Scribblenauts Unlimited, more is explained, about the starites. When Maxwell's sister Lily, is turned to stone, he must collect Starites to revive her. This is however, the last of the starites, so far.
Some people, note this as, more important then Maxwell himself.