In tests one test repeats 3 times always, you need to fix this.If this not a feature of course)

Hello, in my opinion this is a great kata, i rejoise this one. Dont stop with this, you really good in makeing kata;))

Oh god. I think it isnt 7 kyu

Your code is correct. The only problem is that you are printing the array b each time, instead of adding it to a list of lists (which should be your answer). And in the end you should return the list of lists, not the string "This cube is done".

Please read this: https://docs.codewars.com/training/troubleshooting#expected-the-same and this: https://docs.codewars.com/training/troubleshooting#post-discourse