Wall Huggers

Seriously... I did it but I'm exhausted! The level is well designed. By the way, I discovered that throwing R robots when they are on the tranch send them more far away even one by one. Thanks!
I don't know yet why they are frozen at the end of their way...

@Gepeto They stop in front of a wall when it has a hole underneath Apparently they would be tricked into thinking that the hole is accessible and instead of turning around, they keep trying to move forward and get stuck. I think pushing a ball into the hole should make R realize it's a dead end again, but haven't explore this idea yet.

@retrograde Yes I am aware of that -- R's path detection AI can apparently be manipulated by two variables, the first being the availability of land in front of him, and the second being the presence of empty space above it. With some effort I think we could design specific pathways to halt R and let the player manipulate him by adding/removing balls (or any movables).