Wow,the timing required for the bottom level shepherding is incredibly tight, was beginning to wonder if there was another way, but finally got it. The top floor manoeuvres were enjoyable too.
Thank you! I tried several configurations until I found this timing. I'm glad you noticed the work and feel it interesting to play it.
@Anxo Varela ..ive just realised there is a much easier way to get the Rs up the stairs. Spoiler: Move the Rs i realised before that if i could isolate zbot by getting him onto the draggable life would be easy but I squashed B when trying that. I missed the possibility of putting B in the corner where he isn't squashed. Is that the designed way. Certainly a whole lot easier.