As the Challenge Host, you'll make the final determination regarding the awarding of prizes but we can help in this way. We can set your Challenge up so that when the Challenge ends, winners will not be notified in the app until you give the approval to do so. We'll be in touch with you and once you give us the go ahead, we'll notify the winner(s).
1) In a school Challenge, teachers can play but prizes are only for students.
2) In a corporate environment Challenge, contractors may play, but prizes are only for employees.
3) In ongoing municipal Challenges, a user can only win a prize once a year.