Toss a coin, or ip dip somehow choose which team is in.
The out team "team A" build the three stones into a pryamid against a few centimeters from the wall, they (team A) then each take a turn at trying to knock the pyramid down using the ball, standing directly in front of pryamid about three yards away.
As soon as the pyramid is knocked down team A scatters.
Team B who have been standing nearby retrieve the ball and have to tag team A out of the game by hitting them with the ball.
Team A meantime have to try and rebuild the pyramid. If team A manage to rebuild the pyramid they remain in, if team B manage to tag all of team A out before the pyramid is rebuilt, team B get in and the whole process starts again.
Posted by: coco de mer