Nothing really playable, but it's kind of entertaining to watch.
Once I get a new pc up and going I'm going to make a movie of different Rube Goldberg machines using world builder.

You can only use like, 12 objects. No one wants to see a 5 second Rube Goldberg.

you can use more, just the more you add the more likely the game will crash.

you could use the old uke and tori pieces trick we once used. Used in combination you could probably have MANY parts to make a machine from...