Chimney

@Frenzies - looks like she's an advertising bot.

Gaah! Help!

Spoiler

This is about as far as i can get..
.. Although I'm not sure if this is the right direction. I've also tried jumping B off the outside of the chimney. And I've tried sacrificing B to steer R over the goal (but that clever plan got defeated by your cunning pilar). What am i missing?

Wait wait - i did it! Thanks for another brilliant piece of work!

Nice use of a couple of red herrings, plus some multi-use elements. Very very enjoyable!

@Frenzies - I didn't think of that, but here's what i finally did..

Spoiler

Push the ball down the chimney, then make B jump off the wedge down to the ground, using the falling/jumping/leaping exploit where you send him to the wedge, and tap there again as he arrives. Around this time, R will have crossed over the ball, so raise him up onto the ring when he gets to the elevator. When R is out of range, raise B up to the ring too. Then set an autopilot route for B to the block on the ring that is closest to the goal, but drop the elevator all the way down before he leaves it - B will cleverly clear the gap between the ball and the chimney. Then trot along to the goal and... win!

@Frenzies

Spoiler

I tried jumping down the chimney too. It was difficult (sometimes B would get stuck at the top, and I'd have to start again ). But in the end, i couldn't find anything to do when he did go down.

I must try your piggyback technique though, it sounds like fun!

Edit: Nope, sorry, that's officially beyond my capability - your piggyback trick.

@Khudrat - Do you mind sharing what you had in mind as the intended solution?