I use SE and write same everytime::
D:Sudoku\>sudoku -g100 > questions.txt
But usually the difficulty is easy,medium,hard
and there are only 2~4 puzzles with "fiendish" puzzle.
Can it print out all puzzles with "fiendish" when I add something?
ps . If I use -t<filename>, some pattern will spend too much time, I seldom use that way.