So far I have made 2 rube Goldberg machines. The first one is a little house destroyer, where a blue marble destroys a marble house. The blue marble goes down a big marble course then it knocks down a few domino’s destroying the house. it took 5 or 6 tries but it finally worked. The video is too big to load in here. The second one is a toilet paper down the stairs thing. You put a marble on a ramp then it rolls down setting off a chain reaction of domino’s rolling the toilet paper down the stairs. AWESOME. Except the cleaning up part not so awesome. Poor toilet paper. The toilet paper got a bit messy. Whoops.