Four play

Doesn't work on my device.

Spoiler

B can't move after lifting R.

Why can't two-dimensional code be used?

@Don G Rowe

Spoiler

Tap under B as R steps off to trigger claustrophobia.

So compact,so tricky,so challenging,so fun....So...SO GREAT!!Thanks for sharing @Block builder

Tricky moves to get the timing right.

Nice Claustrophobic level..

No words to explain how elegant and short that was made.

I didn't get the 2nd low ceiling move so

Spoiler

I got B onto the surface and went around to the starting point. Tried the Boogie Bot a few times but no luck so used the rotor to get up.

Your move at 20 seconds took over 20 attempts on my device. Thanks for sharing this small level.

@Block builder Nope.

Spoiler

If claustrophobia works and B moves to the stair, R falls back down. If R climbs up high enough, claustrophobia doesn't work and B is stranded.

@Don G Rowe must be a matter of timing.

@Block builder May be, but I sure can't seem to find it.

Nice compact 4x4x4 level. Tricky but fun. Thanks!

Wow! Small but difficult! Thanks for sharing!

Excellent and clever! The claustrophobia trick was great!