Secret Entrance

Spoiler: Stuck

I spent a lot of time understanding the structure inside the building, but in the end I found that R couldn't get in.

@Neil Kuo .. i was expecting the finish would be a low ceiling move with R blocking the outward option but it’s not. Have to look elsewhere.

Got the win but not too sure what allowed R access.

Wow! It's really amazing.

@ridgerunner

Spoiler

He put a metal stair under the stone, causing R to not enter.

COOL level. I accidentally discovered a new move (it's not planned by the correct gameplay), I found it by accident. I like it very much. Thanks.
In a small space - a very beautiful design and interesting gameplay. Super. Thanks

@Neil Kuo @ridgerunner I see from the comments that everyone has the same problem at the end!. I had the same. I realized that something is hidden!

Spoiler

He began to pull in turn all the sliders on the level. That helped. The very first slider blocks the finish line for R.

Stuck. B can't climb stairs or knock ball over.

Spoiler: screenshot

@Chris Hester,by looking at it Chris, R has to push that ball cos he will stretch up more than B .

@shaun Roberts I think you are right. I just tried using R a few times but can't yet figure out how to get him to push the ball. He always ends up stuck on the side, going up and down the steps.

Ok, in that screen shot you need B to stand one block over to the right so R will turn &push the ball, just mess around your get there soon enough.

@shaun Roberts It didn't work. I stood where you said but R turned the wrong way and headed off to the edge again.