Under control

@vince

Spoiler

I didn't, I used it to get down after pushing the first ball. Then the autopilot to go up agsin to the second ball. How do you go from one to other without the exploit? Or perhaps I named wrongly the exploit to fall down from a stair or metal tile?

@nGord

Spoiler: Intoxicating pillar???

First time I hear it. Do we have different names for tap on a point and before arriving to that point tap again so B falls?

I am referring to the first ball. After you push it down to a hole near the elevator, B goes up were the ball was located and arrives to down stairs that goes nowhere. Using whatever exploit name it is, B can fall down and go to the begining again.

@chemi You are doing the right thing but this is différent from the tripping on air trick because you don't have to tap twice on the stairs. @nGord is right.

@vince @nGord got it; although not needed then, I tapped twice...

Passing the zappers is a nice challenge, but getting of the roof after the first ball was unintuitive to me. I've read now that falling from the stairs is required. I figured I could just as well boogie bot to the second ball and skip the bots completely. Do note that I passed them a few times on earlier attempts.