@Marco Spaccarotella Click the + button on the left of the smiley button and click spoiler. Add a title if you want, then click continue and write your hint there. Another way is to use the code Code: [SPOILER="Title"]Hint[/SPOILER] and replace the "Title" and "Hint" with the title and hint (don't take out the ", though), but that takes longer (if you don't want a title, just remove the ="Title").