Place a very large block on the right side of the bottom platform. Draw a wide, very short block "between" the platform and the large block you just drew. It will kind of pop between them. This new block should span to where the ball will fall, cantilevered over the bottom platform and held in place by the big block. Then you don't need much speed; there are no humps.

Of course, there may be other ways to solve it.

You have to draw the vertical block first.

But every time I inserted the second block, it would knock the big block off the platform. So, for stability, I put a second, equal-sized block to the left of the first one before drawing the long block. Then, after the ball lands on the "plank," I just remove the big block on the left. If we were scored on minimal use of objects, I would try harder to get it to work with the two blocks, but we're not

I just drew a huge box that rested on all three platforms. The ball appears inside the box and sort of glitches its way over to the star. That can't be how you're supposed to do it, is it?

Well, you can draw a thin box spanning all three that pops up underneath the ball and then push it over.

But if you want to do it without any odd quirks, draw a thin box that spans the right two spinners and overlaps the right side of the leftmost one. Then draw a big box to weigh that platform down that goes from the left of the center pivot up to the right pivot. Wait for the left spinner to hit the underside of the platform, then draw a box on its left side to pin it there. Then push the ball onto the initial platform you made. (This is actually the hardest part.) Once it's on there, draw a new large box on the right side of the initial thin platform you made, then delete the first weigh-down box. The thin platform will flip clockwise as the left spinner pushes its left side up. From there, pretty much just hang on.