Original sentence: Also, several variations allow additional touches of the ball without hitting the wall or another player.An extended form of ga-ga, which parallels a variation of the basketball game knock-out, includes the rule that if a player gets out after getting others out beforehand, the others are allowed to come back into play.As the game progresses however, the ratio of open space to remaining players increases.Ga-ga can be played in any enclosed space.Ga-ga can be played with a large group of people playing for themselves, a group of people working as a team against another group, or a series of one-on-one matches.If the walls are made of over turned tables and benches, usually they are moved in instead.In another version of ga-ga a player is not eliminated if he or she is hit by the ball directly on the waist, but only in areas below.In some places, while kneeling a player can be hit anywhere and be eliminated.Some house rule versions have a "Sudden Death" rule for when the game gets down to two players where the players are allowed to hit the ball two or three times without it touching anything else, and the players are eliminated if the ball touches anywhere besides the hand.Some versions do not allow "blocking" or "catching" with your hands and arms.Some versions require that only a player's hands and feet can touch the ground.The first offense results in a warning from the judge, and the second offense results in elimination.The human wall acts in just the same way a regular wall does, and can be moved at the judge's discretion.Therefore, the only way to win a "black magic" match is for one person to eliminate all the other players without himself or herself getting out.This prevents players from falling to their knees as a defensive maneuver.To avoid lengthy matches many players may sometimes form a human wall composed of elimated players to decrease the size of the playing area.To avoid the problem of players simply kneeling down and covering the exposed area below their waist with their hands, some variations require that a player cannot stay in the same position for any longer than three seconds.Usually the winner of a game has the honor of either calling out "ga... ga" from the wall of the enclosure or throwing the ball in the pit, thus initiating play