Hi Meg,
I'm glad you like the example.
To limit the question count to 10, I created a number variable called questionCount, with an initial value of 0, to keep track of the number of questions that had been answered.
Then on the submit button for each question I added 1 to the value of the questionCount variable. Once 10 questions have been attempted, questionCount will = 10.
On my base slide, with the spinning wheel, I added a trigger that shows a 'Final' layer when the timeline starts on the slide, and the questionCount variable is = 10.
I hope this helps explain the basic logic, but let me know if you need more detail and I'll do my best to help.