I love sudoku, but I have to say that some of the "Expert Puzzles" should be labeled "Impossible Puzzles" that cannot be done without a whole lot of guessing. My last puzzle only had four numbers represented on the grid...had to guess where the other five would go rather than using logic.
I've played Sudoku for many years & am happy to see it added to the games on Playtopia. It will keep me occupied for many hours. :) CJB