Lesson Learnt

Spoiler: L Behaviour

- L will not pass a second stair if there is nothing under the stairs
- L will fall down one level with the right sequence of objects

Spoiler: Video Solution

Yes i learned my lesson at the single zapper! Enjoyable flowing level. I remember seeing this effect before but again impressive how just the prescence of B at 4:00 is enough to make R behave.

I had sent B to his final square. All was good. L was on his final stretch. The level was completed. 'Twas only time that was needed. I felt good, another quite complicated level was done. Then I said something, out loud, with no one else in the room, that should not be repeated. The level would turn out to have to be repeated, however. And that was fun too.

@Block builder - Funny - if what happened is what I'm thinking, you didn't need to repeat the whole level, only the latter part - unless L wanted to swim a little deeper (white space). Thanks for P, C and R.

@Meko Guy.”don’t need to restart”….but @Block builder and i both presumed that L would fall onto B so we both restarted. Not sure if @Block builder saw it happen but I was also so confident that i focused on B then was shocked to find that L had not come round the corner.

Thanks for this challenging level.
At first , i thought it's a timing level, but after watching the solution..

Spoiler

i thinked about the move at 2:56 but it feels like an autopilot for me.
Instead of that, i release the ball-delayed by B-in the moment L was passing so L fell with the balls.

@ABDSMD mshl - I had changed that area just a bit and with my changes, it was an auto pilot so I had to add the stone pillar route so B could get there faster - hence, no auto pilot is required. As for getting L to fall with the balls - I would never do that. I'm old school and in the first version of Mekorama, if a ball moved, even a little bit, under R then R would be unstable and NOT MOVE. I know the bots are more stable these days but since I rely on having a stable level, one will never know how stable they will be. I see so many risky moves where the builder calls it a challenge but in fact, it's just instability. Thanks for P, C and R.

@Meko Guy L had fallen from the level I think.

...
one important move,
dont forget to hold bowler ball
using B's body.

Very satisfying clean logic level... uuhhmmm, lesson learnt but learnt due to making "that mistake" just in the end... what that surprised me was that...

Spoiler

if B was not where must to be,L falled down but if B was where he must to be,L did not fall...checking your movie noticed that it happenned that way to you too

thanks for sharing & for the fun @Meko Guy