Noteworthy: Scribblenauts ships a million

WBIE announced today that Scribblenauts, 5th Cell's puzzle adventure game that spawns any object a player writes in, has now shipped one million copies worldwide. According to WBIE, which, as publisher, has an admittedly biased view of the situation, Scribblenauts has now reached "blockbuster status."

Keeping in mind that the reported figure is one million units shipped (and not necessarily sold), it's still an impressive number for a third-party DS game -- especially one as weird as an adventure game that features puzzle solving through the use of one's vocabulary. How are other developers expected to rip off that formula?