Was it even possible? The square-like steps are forbidden on the main floor. Of course, you could go up to the first then run down on it, but then you cross the level where it is forbidden? Hmm.
Sorry, Iwas wrong, it is a bit more complicated i see, but anyway, the only one step which you can catch nr.4 is forbidden at the level above.
Good qustion :) Somebody proposed to run up somewhere to level 11 or sth and then down again on other stairs, but don't remember exactly how this went... ;)