Participants are invited to walk around within a designated area. When the command is given, everyone must form teams of 3/5/2/6/1, etc. Between commands, they resume walking. Ideally, the teams should always be formed with different people than the previous time.
The goal of the game can be to divide participants into groups on the spot or to eliminate those who end up without a group. The last two people remaining are the winners.
A lively game, suitable for indoors or outdoors.
No materials required.