Invite this first brave soul to share one or more statements about themselves which others in the group may (or may not) know.
Encourage the rest of your group to listen carefully, and when someone hears a statement that they have in common, they are invited to link elbows with the first volunteer.
Next, this second person will share something about themselves to the larger group, and the process repeats itself with a third person linking arms with the second person because they share something in common, and so on.
Continue play until every member of the group has formed a common ‘link’ with another person.
Note, the last person to link to the very long chain of connections will be invited to share one or more statements about themselves which the very first volunteer will necessarily share in common, enabling these two people to link.
One large connected circle has now been formed.