I'm a master (mistress), or used to be, of the sunday nytimes and LAtimes crossword puzzles of yore, in pen. The puzzles would be near engraved by the time I finished and I often finished; usually as Neo said, after rest phases. No dictionary, of course. Have not subscribed to the NYT every day for decades now, so don't see those other day puzzles, and now don't get the sunday times either.
Alas, I tried online puzzles and they annoyed me (you know me, easy to annoy). I want to see the whole puzzle at once, per favore. Maybe the online puzzles have changed, and if so, please let me know. See, if I am getting nowhere on the upper left, I'll scoot down to the lower right, and so on. I want the whole picture. Is Will Short still around?
On suduko, I tried it once and said, what?
edit - on crossword puzzles, no tips except keep thinking.