Spoiler: Trick List - auto pilot (tap and move slider to redirect B) - elevated eye (an elevated eye will change the properties of the block above to not passable) - low ceiling (B acts strangely with a low ceiling and may travel over stairs that B can't normally do) Spoiler: Video Solution
A superb long logic level. Satisfying to solve. My win was shorter. I had problems getting the elevated eye to work and wondered if i had the wrong gameplay for a while. Spoiler: Variation At 6:15 I considered the long video route for B but wondered if P might get jammed under the wedge. So simply sent P back to the ball and blocked P. Move B to the ball to direct P on the return.
@ridgerunner - Clever again - I didn't see that much shorter route. The elevated eye works best with a slight upward lift versus a forced one - on my device. Thanks for P, C and R.