Prisonball

This makes for a hectic game since as players are eliminated, teams will eventually be attacked from all four sides.

Some variations make it so that prisoners can not attack opposing players, but if someone from their team on their side throws a ball and they catch it, they can come back in.

Nationball (popularized in coastal Los Angeles and in past years played in schoolyards and the LA County Junior Lifeguards program[1]) is a variation played with one ball and with one player from each team starting in the "prison" serving as the goalie.

Only that player is allowed to return to the main court as they start the game with an extra life in exchange for initially serving as the goalie.

Once other players are hit with a ball, they can continue to play the game but must remain behind the court in the "prison" area.

If a ball is caught, the thrower is out and must go to the opposite end of the court to their respective "prison" area.

Another usually standard rule is that "caught" balls are equally considered such (for the purposes of getting taken out or put back in) whether they are thrown by active team member or prisoners.