In my first attempt, B always falls out of the first Pillar-R (P) bot if he's going to the next Pillar-R (P) bot. I tried another way to win the level in my first attempt. Spoiler: My way I put B in the slider, then B rode the first Pillar-R (P) bot. Afterwards, the Pillar-R (P) bot with B above (the first one) tried going near the win block and B won. I add a star for the concept and design. Thanks for sharing.
MARVELOUS! First I thought to align them, I was STRUGGLING. But passed with your hint. MIDWAY! They looks so satisfying... Spoiler: Image
I gave up after trying for long and struggling to align them. Decided to revisit upon reading Pratik's comment about midway and then it clicked. Nicely thought out. Thanks for sharing.
I nearly gave up, just kept falling off. Then I read the comments and realized I had missed the point, ! Very nice!