I'm having the same problem, can you elaborate on what was wrong?

That's awesome

board=[[1,2,3,4,5,6,7,8,9],
[2,3,1,6,4,5,8,9,7],
[3,1,2,5,6,4,9,7,8],
[4,5,6,7,8,9,1,2,3],
[5,6,4,8,9,7,3,1,2],
[6,4,5,9,7,8,2,3,1],
[7,9,8,1,3,2,5,4,6],
[8,7,9,2,1,3,4,6,5],
[9,8,7,3,2,1,6,5,4]]
give it a try

"and each of the nine 3x3 sub-grids (also known as blocks) contain all of the digits from 1 to 9."

[1,2,3,2,3,1,3,1,2] This is not Sudoku

I passed all attempts except the fourth :(, does anyone know what this test is? I would like to know where is my problem.

“and each of the nine 3x3 sub-grids (also known as blocks) contain all of the digits from 1 to 9.”

I solved it, I didn't consider the situation of going up to level 8 after solving the problem

Maybe a level 8 problem was solved before it

I'm passing every test, except one that says "After applying rank of 8 the progress was expected to be 0, but was actually 1"，but my test of "inc_progress" in Spyder shows that if the user reaches level 8 it will equal 0 for all questions at that level ，I don't understand where the problem is