Right now, line detective tells you if a clue is finished, no matter if you should already know its that specific clue. It would be good to have an option to get the highlight of which numbers you have finished, without getting more information out of it.
Either by detecting that there is no other way the clue can fit in the line/column or by giving the user the option to highlight finished clues themselves.
That way, lines and columns with a lot of smaller clues are more convenient to be solved, but not easier.