This one is harder than I thought. Contraption building is tricky. The falling object generator occasionally vanishes random blocks. Gave up on using block ramps because the Random chest that drops in Toy Boxes kept manifesting in ramps and blocking rolling objects.
I've spent the better part of an hour trying to get a basket ball through a series of ramps and into a hoop.
I think I'm probably doing a series of contraptions each one on an island and blocking access to the following island until the contraption is successfully executed.
So far I have one island and one functioning contraption.