Stone Park

Each ball gets a star.
(You should have kept that 6th ball like in the beta test version )

@Block builder The challenge doesn't allow tricks, unfortunately...... (one of the reasons why I still haven't made my entry)

@D.S.Masters - You are correct.

Spoiler

I would classify getting over the third ball to the fourth an exploit of Autopilot.

@D.S.Masters

Spoiler: Ball order

No, I would call that one the first one.

Update:

Spoiler: Solution - Order

CORRECTION 2020/10/06: This image is what my original assumption was to the intended solution. I have since settled on 3, 1, 2, 4, 5 and posted a solution video on page 3 of the comments.

Spoiler: Solution - Exploit

@D.S.Masters I'm not quite sure how one could autopilot over the ball you mentioned (#1 in my image above).

In order to autopilot over ball #3, topple it over and then as it passes between the stone and grass block, tap on the grass block (or any accessible block beyond it) and B will calculate a valid path to the spot you tapped (despite that ball being well gone by the time B needs to cross that gap).

@Don G Rowe I would say

Spoiler: Ball walking

...that walking over a ball is the same as walking over any block and perfectly acceptable. Walking over a ball that used to be in a certain location but has since rolled away is (in my opinion) an exploit of the autopilot routine. Physically it shouldn't still be possible, but over one space gaps it still works. It works for other objects, even zapper bots, as well.

There seems to be some confusion as to the intended solution. There are no tricks or autopilots necessary, unless you count

Spoiler

walking on a rolling ball.

Spoiler: Intended Solution

Push the yellow ball then the red ball. They will form a path to the purple ball. Push the purple ball and quickly get to the concrete path at the left and then onto the rolling ball. You must get off the ball just before it arrives at the dead end so as not to hit the blue ball just yet. Push the orange ball down. Then the blue ball. Now walk to the win.

@D.S.Masters its more about pushing the ball slowly than being fast enough to catch it later.