The game has an appropriate difficulty level for kids and because puzzles can be solved in different ways, the difficulty in inherently flexible.

In Scribblenauts, the goal is to help other characters perform physics based tasks, and you can solve them in any way you want. You can create any object by typing it out and use them in creative ways to solve the puzzles.

You can write in tons of nouns and have them appear in game. You can also add adjectives to the nouns to modify them. By having the words appear and add to the gameplay, it encourages building a larger vocabulary.