I finished the first couple marble run blocks this week. Introduced them to see how the play factor would work. A little bit advanced for my audience. But still interested in them.https://hugh.thejourneyler.org/wordpress/wp-content/uploads/2018/01/img_8053.movhttps://hugh.thejourneyler.org/wordpress/wp-content/uploads/2018/01/img_8050.mov