I Rediscovered Sudoku

I'd tried the number game before but never could solve even the easy puzzles. Yesterday I discovered I'd been playing it wrong. I thought besides having to keep the 9 digits from repeating in each row, column and square that I also had to keep them from repeating in the long diagonals. Once that premise is thrown out it's a heck of a lot easier. So yesterday I plowed through 7 puzzles, all 3 levels, easy, medium and hard till 12:30 am. These are in my local newspaper. It seems to me that they have a poor rating system since some of the "medium" ones are harder than some of the "hard" ones which were a breeze. The one I'm working on now is labeled correctly, though. It's labeled "hard", and I've been at it on and off for a couple hours. I really don't need another addiction taking my time.