as identical lines or columns aren't marked, a mistake becomes a tedious process of attempting to find the error. I might be the daft one for sure, but I'd rather be frustrated by the logic instead of my stupidity. meh
Developer reply
Thank you very much for your review concerning our game. We have already prepared update for managing showage of mistakes for duplicated columns/rows, which will be live in day or two, after Google approves it. Thank you once again.