I hide answers by 1) changing the font color to closely match the background color and 2) inserting several lines of dummy text in front of the hidden answer -- to push the answer out of the 'Latest Posts' summary which appears on the forum's front page.
In the 'Latest Posts' summary, I sometimes see the answer spoiled before seeing the puzzle.
View attachment 10206
Do you remember how to change font colors?
I understand that inserting six lines of dummy text will be too much of a bother for some people, so maybe we need a new system. We could submit answers by PM; the OP would then post acknowledgement(s) in the thread. (Although, it seems just as easy to paste six lines of dummy text and change the font color, to me.)