When answering contests and quizzes, we suggest that you hide your answer, to keep the fun going, so that others give it a try too. You can do so by using spoilers tags.
[spoiler]the answer[/spoiler]Typing the above in your post, would show up like this:
If you give up and want to sneek on other members' answers, or if you're the one who started the contest and want to check out the answers, you can do so by dragging your mouse over the black area, while pressing the mouse button. This reveals the answer temporarily for you. But do give your answer first!