So it's solved.

Sorry, I haven't been active lately. I have a few questions:

• What do you mean with "unknown error"? I guess that's an error from the Codementor framework, so I'm not sure I can do anything about it.
• "should give more points" - as far as I know, community votes decide how many points each kata should give, and I can't change that.
• "matrix[x,last position] < matrix[x+1, initial position]" - I'm not sure I understand what you mean. The kata gives you only two guarantees: matrix[x,y] < matrix[x+1,y] and matrix[x,y] < matrix[x,y+1] for all x,y < max. Are these guarantees violated?