Too much work

I almost got it without the video. The ball was the hard part. The 1st time it fell on it's own while B wasn't near it so I continued that method (wiggle the sliders around it) but it missed the mark slightly every time.

Spoiler

Trying something new, B wouldn't go thru at the top but the video showed B needed to be over one square on the slider for the auto pilot to work.

The rest was clear and even though I needed many restarts, it was fun so thanks.

@gmacpro Yes the autopilots sometimes aren't successful. But they can be redone. The two-tile sliders are for convenience, allowing less speed between actions. Thanks!

I agree with the REDONE comment as I needed it. You can even redo the one to the ball level which I did over and over trying to find another way.

Really tricky but nice tower. Some steps were pure logic and others...
Thanks!

First time in a while that I can solve one of your levels without having to watch the video!
It's cool how the tricks are part of the puzzle, having to stop and think about the next step.

Very enjoyable especially as some moves were easily spotted but the outcome wasn’t clear till completed. I also took several attempts to get to the ball but its nice to be able to simply retry. On the top floor i presume you deliberately designed the metal block/rail/slider to cause some uncertainty. Watching it vibrate i was sure it must do something!

@ridgerunner An unmovable (i.e. constrained) metal piece makes B stick to it better. If it were stone, B could easily fly off the level, which would be highly frustrating (though it may still occur, just less likely).

Excellent. The last move and going on the roof was very interesting. Thank you

WOW!! Excellent logic/TRICKY level...A big challenge!!...Thanks for sharing and great job @Block builder

Nice view. Much chore