Difficulty is built into video games in a different way than in any other medium.
A movie may be difficult, conceptually or in terms of subject matter; it may be hard to understand or to enjoy. Yet all you have to do to access its entirety is to sit and watch from beginning to end.
Written words can be still more difficult. For these, you need a formidable mastery of language, concepts and context; you must convert text into sense. Still, the raw materials are all there for you to work with. You do not have to pass a tricky test in order to get beyond the first chapter. You won’t find yourself repeatedly sent back to the start of a book if you fail. You do not have to practice turning a page at precise moments in order to progress.
via Ars Technica http://ift.tt/1h5CEjQ