Split the group into two different teams. No one is to pass the middle dividing line that separates the teams. The objective of the game is to knock out everyone of the opposing team.
Divide groups in appropriate size. For example a group of 20 be divided into 2 groups. A group of 24 be divided into 4 groups. Each group, now teams, should line up facing in the same direction.
Like the game of Tag, the person who is IT must tag other people. When those people are tagged, they link with the tagger and team up to tag others. No one is left out of the game.