The tasks that you get asked are achieved by keying with his notepad solution concepts. Here almost no limits. Only brand / proper names and racy terms not go. Even one or two words in the translation is time well set, but a total of solving the tasks running quite round. You can be really creative and that makes a lot of fun!
In the beginning you get the basic concepts / options explained, so you quickly safe and well versed in the world. You are right in the adventure and can live. So many brings one to ponder, but also laugh - and the solutions are almost no limits.
With the Wii U version has also the great object editor which allows you to change objects (bigger, smaller, different pattern, removing and adding parts to an object, etc.). This gives the game is another fun factor that pleases me incredibly well. In the 3DS version of Object Editor was unfortunately left out - a great pity (and the 3D effect is not really there, but more on that in my review for 3DS Game: Scribblenauts Unlimited).
CONCLUSION: A great game that is great fun. Who has to decide between the Wii U and the 3DS version, should rather resort to Wii U version, since you actually get more.