It mostly depends on the delay, which is mobile device dependent and the complexity of components in the level, a slower processing rate is required to pull it off correctly. In theory I think it's primarily due to false walk forward induced into B-bot's algorithm due to sliding the metal bar .
@Rohan Kumar - LOL! This is so cool. It works sending him the other way as well (ie: no stairs needed)
I believe this is what @monski is referring to: Four R bots facing different directions so that their movement would cancel out each other. I guess the game cannot render this, hence the disappearance of the entire object.
Actually, the game can render multiple R bots facing different directions, although they function weirdly. @Scare Crow discovered that the glitch only happens when one of the R bots is facing a certain direction.
It's a nice mechanism, but it's similar to richardfu's mechanism in The Mill. Also, why did you post it here? This thread is just for bugs, and not mechanisms.
Guys... I think i have observed the complete pattern of a headless r bot movement on stone flooring...but the image size is 3 mb...so i cant post it here...can anyone suggest a way to do so.....its almost a month