Scribblenauts Unlimited will offer very similar experiences on Wii U and 3DS. According to Nintendo Power, both titles contain the same missions, worlds, upgraded dictionary, and open-ended gameplay.
So what sets the two apart? Nintendo Power says Scribblenauts Unlimited 3DS “will include StreetPass functionality that will allow you to see what objects other players have used to overcome the game’s challenges, as well as stereoscopic 3D enhancements for the cinematics.”
There’s one important element missing from the 3DS version though: the new object editor.