Create your own Challenge

To create your own challenge, please follow this link.

You will be asked to provide the following information:

  • Short name: this will be used for the url, specific css and files. For this short name, no special characters or spaces are allowed. The short name will initially also be used as the title of your challenge, but you can change the title later on in the challenge admin settings. The title can then contain spaces and special characters.
  • Description: This should be a short (max. 1024 characters) summary of the project. This description is displayed in the info pop-up on the challenge overview
  • Participant review: if this box is not checked, anyone can join your challenge. If participant review is selected, users have to request access to your challenge and you as the admin of the challenge have to manually accept participation requests.

Creating a challenge sets up a new sub-domain on with your challenge's short name:

Custom pages for your challenge

When a new challenge is created, Grand Challenge automatically creates a general description page with the challenge title in it. You can edit this page by clicking the edit button on the page or by navigating to Admin → Pages. On the latter overview, you can also create new, additional pages, for example a page for submission guidelines or a page with a timeline for the challenge.

For any page, you have to provide a title, which will be used for the url and which cannot contain special characters or spaces. There is an extra display title field, where you can optionally specify a longer title (with space and special characters). If you specify such a display title, this title will be shown in the navigation tabs under the Info tab instead of the short title.

You can choose to hide a page by selecting the option Hidden. Furthermore, you can also assign permissions to each page individually:

  • All: everybody can see this page, even users that are not participating in the challenge
  • Participants only
  • Administrators only

Editing content can be done through an html editor. For security reasons, we clean the html you enter and so it could be that not all content gets displayed as you intend. Always make sure to check your page after editing. The editing options displayed in the top bar of the editing window work as is, so these mark-ups will definitely work.

Finally, you can change the order of your pages. For that open the edit window for the page you want to move, scroll down to Move and select one of the options (up, down, first, last).

Participant Review

To manage participants, go to Admin and select either Admins or Participants to add or remove users from these roles respectively, or (if enabled) go to Participation Requests to accept or decline access requests.

If you would like to enable participant review retrospectively, you can do that under Admin → ⚙ General Settings → Registration.


You can add a discussion forum to your challenge. To do so, navigate to Admin → ⚙ General Settings → Information and check Display forum link. Click here to see an example of a challenge forum.


Teams allow groups of users to be identified on the leaderboard, it does not limit how many submissions each team member can make.

You can turn this feature on by navigating to Admin → ⚙ General Settings → Teams and then check Use teams.

Multiple phases, multiple leaderboards

By default, a challenge has only one phase, but you have the option to add multiple extra phases to your challenge. Each phase has its own submission procedure and its own leaderboard. To add a phase, navigate to Admin and click on Add a new Phase in the sidebar under Phases.

Above that you see the links to the settings pages for each of the phases you have set up. You can customize the submission and scoring procedure for a given phase, set start and end dates for the phase, and decide what the leaderboard looks like and how the results are displayed.

⚠️ Note that if you set start and end dates, participants will not be able to make submissions to this phase before / after the respective start / end dates. Note also that you are free to set only a start (for an open-ended phase) or only an end date, or leave both dates empty. If there are no dates set, participants will be able to make submissions as long as the submission limit is set to a value above 0.

Examples of challenges that have made use of multiple phases are Midog2021 or PAIP2021.

Closing your challenge

To close a challenge either set the submission limit of all phases of your challenge to 0, or set appropriate phase start and end dates for all your phases. A challenge is considered as completed only when end dates are set for all phases of the challenge and when these have passed. When no dates are set, and all phases are closed because their submission limits are set to 0, the challenge is marked as not accepting submissions. In all other cases, the challenge is considered to be accepting submissions.

Deleting your challenge

For deleting your challenge, please contact

There is also a video that explains some of these first initial steps: