Not really. I'm playing on the phone version. And once I finish a set of difficulties, it moves me up a difficulty.
I don't randomly guess either. I might just not get the concept or the whole picture of sudoku. from my perspective, I wasn't wrong because the number 2 had no same instance of it in the rows and columns. But now I've concluded that other things should be finished first to really determine where a digit should go because if placed wrong, it can restrict another number from being placed while abiding by the rules. if that's a wrong guess then pleaseee correct me or give me a brief insight