We support closed challenges/contests for this specific purpose, which can be joined only via an invite or ADMIN override. With the HR dashboard, you can add any subset of your user base to a closed (private) challenge or contest.

There are three ways to do this:

• Enable registration for only a selected group of people.
• Create a challenge that applies only to a selected department, Location, gender. You can also set a combination of these filters or demographics. For example, if you want to create a challenge for the female employees in the marketing department of your business unit in Australia, just select the necessary filters.
• Create a private challenge and send an invite link to only those people who you want to join.