Rube Goldberg Machine Puzzles: Which Door Will The Ball Hit? [Video] I challenge you to these six machine puzzles. Guess which door the ball will go through by imagining how the machine will run. I bet no one can get all six correct! [Joseph’s Machines] Sharing is Caring:FacebookTwitterEmailMorePinterestMastodon Geeks are Sexy needs YOUR help. Learn more about how YOU can support us here.