Hovering on ground

My turning ring approach works more than half of the time, at least when I tested it. What's the landing platform you added? I think B would turn back to normal whenever it falls to a lower platform.

Edit: Lol, I see what you mean. But why does it have to be on the ground?

 

I was testing the idea of attaching a motor draggable onto the box so that I could make B fall onto the ground once he's hovering. Doesn't work since B always stops hovering once the spot he is standing on is dragged horizontally. I did however notice that B would keep hovering on a vertical draggable, so you can first make him hover on a draggable and drop him to a lower level (which, still, is above the ground ).

Instead I created this as a side product - a modified version of @richardfu 's, now with four entrances / exits

 

Sounds interesting, if it could work... As long as you have any block in the level - including the goal - tapping on it gives an x and you can use it to control the hovering.