Challenge directory
Groups that have said they're up for a head-to-head. From your own group page you can pick one of them, get a random match, or share a link. A challenge always needs the other group to accept, so nobody's dragged into anything.
Up for a challenge
No groups in the directory yet. A group owner opts in from their group's owner controls: "Open to challenges".
To challenge a group you need one of your own. Start a group and open the Group v group builder from its page.