Clever timing! Spoiler Among top Balls, my first ball fell perfectly without Slider. But second Ball went on first Ball route. I was like wait! What?! Then I had to use Slider. After all Balls were down, then I realised. Oh! Its a timing level. That was fun doing See-Saw!
I've played it three times and B needs to jump over where the ball was or where the See Saw was each time, twice, so auto pilot was required for me. Overall nice clean level - on the second auto pilot with the ball (not the see saw), B can land on the white space due to the sharp corner.