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Overview
Kahoot gives you the ability to create private groups so that only certain people can see the Kahoots in the group. This works great if you have a training team or a group of instructors all teaching different sections of the same class.
OIT recommends that you keep your original Kahoot in your personal workspace. Duplicate the Kahoot you plan to share with the group so that you have a back up in your personal workspace so that if someone accidentally deletes something you still have the original Kahoot.
Information
See this article from Kahoot on how to create groups: How to create a group – Help and Support Center (kahoot.com)