Why?

Complex! One passage is kind of hidden, and I didn't use one ball out of laziness. I guess it should be used to let P emerge from underground, but I just fiddled with the slider instead.

@Block builder
Wow, you're really **** fast! You are one of the absolute professionals ... I do not know how this level could be finished without using all the balls? !! I am glad, if it was a challenge for you and you had fun ... thank you for the fantastic rating !!!

@ToVo - since you didn't say - Are tricks required?

@gmacpro

Spoiler

[
Yes, it only takes a little trick ... Robot B has to jump on the slider between the + and - blocks. The draggable must be pulled up just before Robot B would run over it
]

@ToVo - I was very close and I can see how to win but I gave up due to frustration for a few reasons. The P's seems to walk thru the lower passage sometimes but not always (they get stuck). The ball that goes up and down, tends to drift away more times than sticking and P sticks if the ball isn't there. For me, the level was unstable. I too didn't need all the ball (the center ball one). BTW, if I persisted, I'd get it but I'm done as I've spent long enough on the level.

I will answer tomorrow....you`re right...only some times the same happens to me...perhaps I published this level too fast?!! Thanks for your patience to try this level

YES MY FRIEND!! Great,difficult,challenging level!!Excellent path,with clever steps...I really had a lot of fun!! The + - design is so pleasant!!Thanks for sharing and gorgeous job @ToVo ...Btw,I have doubts about your intended way so I made this movie...
https://photos.app.goo.gl/xmC23V8SIbdwkkdz2
If that is the right way...you are genius...if not,I'm the genius

I completed without using the balls furthest and nearest to winblock, so obviously didnt use the hidden passage either. It was still a challenging and very enjoyable level though.

@ToVo - It came to me in my sleep what the other ball was for.... My brain was saying why does he have a fence on the slider and what's the center ball for...

Spoiler

Originally, I was sending a P back thru the tunnel to get B but P got stuck each time, using the center ball eliminates the need for the tunnel at the end.

@delator77
Here follows my reverence to his Royal Excellency, my friend and Mekorama King "Delator 77 the genius"! Thank you for the exuberance in your eulogy and the excellent rating. It's always a relief when players like you have fun at a self-created level and enjoy the challenge. Incidentally, you have found EXACTLY the solution that I have planned and for that I am particularly pleased! Thank you Thank you.

@ToVo So you are the genius,my friend!!

@gmacpro
Help, you dream solutions while sleeping? But apparently the right ones ... the movie from @delator77 shows my intended solution! There are certainly a few small variations, but only Robot B was meant to wander down to the basement Sides to push the ball on the "-"block. Thank you for your patience while playing and for the sensationally good rating!

@delator77
I would not have solved this level if I had not built it myself ... I'm amazed how you can always do it! The genius is YOU!

@ridgerunner
Wow, but how? I have no idea how this level can be done without the balls you mentioned. Your "special" version to solve the level "Master Thief II" had already overruled me and made me speechless ... I'm curious, your bag of tricks must be very big? !!
Thank you for your great 5 star rating!

@ToVo - one ball pushed solution

Spoiler: One ball

P.S. i forgot that the door bell rang when i made this so there is a big gap in the middle! Didn’t bother including the obvious finish.