Another interactive machine.  I liked this better than the previous two.  
This was all about timing.  You're trying to get the balls to the top 
level.  The wheels rotate.  If you get a ball in the right slot in the 
wheel, it'll get deposited on the next level.  If you don't, it'll be 
tossed back to the bottom.  You have to release the balls at each level 
at the right time to get it in the correct slots.  Simple, hard, but not 
too hard.  It reminded me a bit of Donkey Kong (timing jumps, timing 
wheels).