Great quiz! One hint to make it even more interesting is to hide each clue cell until the previous answer has been entered. To do that, after you've written the quiz, go to Step 3 - Quiz Design, click Design Mode Manual, then click your second hint, then click Hide, then tick the box of the first answer. That way the second clue is only revealed after the first answer is given. Then you can work your way down the whole quiz like that.