Yes, the 1st Mandelbrot. I'm fine with it where it was. I think it was just the way my mind was processing the image. It was a challenge, but the systems in place gave enough freedom and aid to allow players to work with it at their own level, and to skip past it if needed. If not for the aids, and being able to skip, then it might be to tough and stop some players. If you add more puzzles, then I could see adding more earlier and building up more slowly to it, but with what is there it felt fine.