Nice series to play and have fun with with, well done.

yes

in JS random tests output looks like

Sequence is 'Y d2 M Y' f b' U f2': expected 'ggbggbgbbowywwywroroorooywywyrwyyroyw…' to equal 'gggggbgbbowywwywroroorooywywyrwyyroyw…'

I suppose seeing all 54 letters would be helpful for debugging

Done, now we can better distinguish between the solvers and simulators.

you make a good point, dfhwze. changed to 4kyu.

Rank inflation is a thing to consider too

This is a selffulling propecy. Skrew this inflation :)

agreed, call it "Rubik's Cube simulator" maybe?

ah, maybe I should change it to 4kyu. However the 3x3 solver it estimated at 3kyu only, and the my 2x2 one is much easier imo. Rank inflation is a thing to consider too... Oh well, maybe I should get more completions on my kata first, then let the community decide.

I suggest to rename this kata, as this one does not want us to solve a cube, but to simulate a list of moves on solved cube instead.

added to description

Your 2x2 kata is probably also 4, no?

I agree it would have been better. But kata got approved without this suggestion.

Those shouldn't be deleted, even if it were possible. Once published, your submission is part of the historical record.