I was thinking about whether it was possible to bring the object ball to the goal, back to the start, and then repeat ad infinitum.
Since it actually running infinitely is silly to test, I've decided to call it a victory if it goes to the goal and back 5 times, as anything after that is just silly tweaking. It proved to be a fun little diversion, and here are my results for the first page of levels. I've labeled the interesting ones:
Rolling away (success):
http://FantasticContraption.com/?designId=2651838Reach up (success):
http://FantasticContraption.com/?designId=1980495Mind the gap (success/interesting):
http://FantasticContraption.com/?designId=1979838Junkyard: Still working on this one, but I think a strategy similar to The Wall might work
The Wall (success/interesting):
http://FantasticContraption.com/?designId=2656928On a Roll (success):
http://FantasticContraption.com/?designId=2657267Full-Up (success/interesting):
http://FantasticContraption.com/?designId=2381008Higher (success):
http://FantasticContraption.com/?designId=2381141Around the Bend (unsuccessful, but getting there):
http://FantasticContraption.com/?designId=2687542Up The Hump (unsuccessful, but close):
http://FantasticContraption.com/?designId=2697291Mission to Mars (success):
http://FantasticContraption.com/?designId=2381586And some submissions from others:
Four Balls (Moral victory):
http://FantasticContraption.com/?designId=1603521 (hurkyl)
Big Ball:
http://fantasticcontraption.com/?designId=3053137 (hurkyl)
Handling:
http://fantasticcontraption.com/?designId=2772233 (flagitious)
Tube:
http://fantasticcontraption.com/?designId=2777216 (flagitious)
Back and Forth:
http://fantasticcontraption.com/?designId=2826082 (flagitious)
U-Turn:
http://fantasticcontraption.com/?designId=2940245 (mandydax)
Please feel free to contribute your own! I didn't really try anything on the second page, and would be pretty impressed by any solutions there (I think U-Turn would be the first).