Does Challenge Hound support multiple administrators?

Yes. When you create your first challenge, an organization is created within Challenge Hound. You can add other administrators to this organization. Each administrator can manage groups, challenges, and purchase credits. Once you've created your first challenge, head to this page to add additional admins:

https://www.challengehound.com/organization (logged in only)

All members of the Challenge Hound will be able to add, edit, and delete groups and challenges, as well as fully administer challenges. Any challenge or group created by any member of the Challenge Hound will be administered by the entire Challenge Hound organization. Any member can purchase credits. Credits are applied to the organization, not the user.