This is so smart in 1) how the mini R's create interesting block heights, 2) how their position requires a specific order of being zapped, and 3) how it's all in such a compact level. I failed to see how to use the horizontal slider to make it easy, and instead felt really rushed to perform the second R-zap. It was possible though.
@Chris Hester Sorry for the inconvenience. Timing is needed at the end! To get to the autoslider correctly, you need to freeze a stack of bots and release them at the right moment. You need to calculate the time correctly
Got it! B stayed on this time. I did the whole level quickly too, having memorised the steps. Good design! Clever trick with the bots holding up the central blocks too.