trick course

Very tricky and challenging.

Spoiler

B did not always climb on the ball, which became a bit annoying after some attempts. P usually fell from the level. Only a well timed evasion by B made it work.

Challenging, and also slightly annoying (i.e. psychologically challenging ).

Agree. The timing is super challenging. Superb neat level

Well, I need more information before wasting time...

Spoiler

obviously I thought about an autopilot to climb using the ball but I can't perform it so I have a question cause maybe I am doing wrong... B must play soccer with the ball in the white space or B must push the ball from the outside to the inside to do the autopilot?btw,the second option is what I was trying but B do not want to climb

Yep, quick but very tricky... in the end I was having the right gameplay but I can not explain why I couldn't do that step... the very curious thing is that I spent more than twenty minutes trying without success until I did it but after this first success all the others were successful... & do not why cause I did that step always in the same way... thanks for sharing @韩国庆

Ooopps the rating

@delator77

Spoiler

You have to push the ball inwards, and autopilot on to it. For me B ascended the ball about 2/3rds of the times. After that, B might not properly stand on the rail. Give him some time, maybe squeeze him a bit with the slider. Even then, I needed some restarts.

Edit: you just posted your comment.

@Block builder ... still... thank you very much for your help... my comment and your help have overlapped...