Riddle is a nice quiz creation service that launched back in May of this year. Since its launch the developers have steadily added new features. The latest update introduced the option to collect the names and email addresses of people who complete one of your Riddle quizzes.
Riddle quizzes and surveys can be image-based or simply text-based. You can add links to your Riddle quizzes and surveys. Those links could be to sources of information, to videos, or to an online audio recording like those you can find on SoundCloud. In the video embedded below I provide a demonstration of how to use Riddle to create a quiz.