Adding more than four failure levels in a multiple choice quiz (Cp 5)

Captivate currently only gives you up to three Failure levels. Perhaps future versions will offer more.

Depending on your intent, you may be better off using the Advanced Answers option that exists for Multiple Choice questions.

Failure levels give up to three separate different failure captions if the user answers the same question incorrectly.

CORRECTION: I just tested this on a sample project and found that after the final failure level caption appears, no other failure captions will appear for subsequent failures UNTIL you reach the last attempt.  Then the default Failure caption for the project will appear. So it seems that if you set your attempts to 4, you will get four captions in total. One each for the three failure levels and another final one for the ultimate attempt.

The Advanced Answer option can be turned on by selecting the Answer Text for one of the possible answers, then going to Properties tab > Advanced Answer Option accordion and checking the boxes for Advanced Answer Option and Show Feedback Message.  This will then show this Feedback Caption for that particular answer IF IT IS SELECTED when the Submit button is clicked.  So this caption will then appear for that answer, regardless of whether or not it was the correct or incorrect answer.  This allows you to explain to the user why this answer is not the correct answer or congratulate them if it is.  It also gives you the option of branching the movie to another slide based on that answer (if desired).

The downside is that if you turn on this Advanced Answer option, you don't get the other Success Failure Hint captions appearing at all, and the only way the user can retry the question is to redo the quiz again via the Retake Quiz button on the Quiz Results slide (requires that you specify multiple quiz attempts).