One site I regularly visit is Conceptispuzzles.com, developers of graphic logic puzzles. Here they're known as PAPs (Pic-a-Pix). You will also find other types of logic puzzles. There's FAPs (Fill-a-Pix) which is a bit like the old Minesweeper game where a numbered cell tells you how many cells surrounding it are to be shaded. The twist here is that you get a picture when the puzzle is solved. Likewise with LAPs (Link-a-Pix). Join a number to its twin with no lines crossing. There's also MAPs (Maze-a-Pix) which is, of course, a maze that produces a picture on completion. Conceptis also make Kakuro, Sudoku and Sudoku variant puzzles. There are free puzzles to print out or do on-line, updated weekly. There's also a very friendly, helpful forum.
The Hanjie I referred to is a magazine published here in the UK. Not associated with the website of the same name, which I think is the one you mentioned.
I prefer paper as I have difficulties doing puzzles on the computer. I get woozy! I'm pretty sure when I first joined Griddlers way back there was a facility to print out puzzles but I can't seem to do that now.
Regarding the extra large puzzles. Cast your fears aside and have a go! At first they scared me. I pulled them out of the magazines and stored them out of sight. Fancy being scared of a puzzle! Anyhow, when I plucked up the courage to have a go it wasn't so bad after all. Think about this - if you can do a 15x15 puzzle then you can do any size. The strategies are still the same, just extended over a larger range of cells! Time consuming - yes, but very satisfying. I can't imagine what it would be like to try one of those on a PC, though!