cardboard circle - red (R) on one side and white (W) on the other side.
Scatter, with a goal line at each end of the play area.
One person is "It" and stands in the centre.
Divide the group into two teams : Red and White
"It" tosses the cardboard circle in the air.
If the cardboard circle lands on red, the red team runs rapidly to get
behind its goal line.
Any player caught becomes a member of the other team.