I just picked up 13, it's OK... stuck on Odin. I know there is a sequel, and maybe a sequel to that in the works, but what else can they do? It just seems like they design a bunch of cool stuff, and then make a game around the art. Perhaps I'm wrong. For the record, I have played and beat 1,4,6 and 10. 6 is hands down my favorite. Thoughts?