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Divide the hall into four quarters.
Divide into four teams, one to each quarter of the hall. Each team starts with 5 points.The ball is thrown from one area to another. Doesn't matter which. One leader who cannot see the game will blow a whistle at random intervals.When the whistle goes the team who has the ball loses a point. When a team loses all it's points, the team is out, although one or two scouts should remain in the quarter to return the ball to play. If the whistle is blown when the ball is in a quarter of a team which is out then the team which last had the ball loses a point.
Be the last team in.