PO0Ky I can't get it either. Either I go too far, and the janitor is there, or I don't go far enough and nothing breaks. Not sure if he means the back of the stage (behind the curtain) or the front of the stage after you fall off.
The trams move too fast, and the paths are too confusing to parse in one go. Perhaps it would be easier if I knew what colour was coming next, knew how many trams we need per stop, if the trams appeared in a logical order.