In the outdoor game four-square, players attempt to bounce a ball in such a way that another player cannot return the ball. When someone fails to return the ball, they move out of their square, and everyone else advances a square, hoping to reach the server square, where they get to dictate what types of bounces everyone can make. The fact that this game is played outdoors in a grid of four squares with a bouncy ball is an example of what element of a game? objective
operation
obstacles
outcome