Count off by twos to form two teams. Direct the teams to stand on opposite sides of the line.
A representative from one team takes a deep breath, holds it, and crosses the line to the other side, while making the sound "CHACKGUDU,GUDU,GUDU,GUDU,GUDU,GUDU,GUDU,GUDU... ." They must try to tag a player on the opposite team and return to their side before running out of breath. Meanwhile, the opposing team tries to catch and hold the player until the player runs out of breath.
If the player succeeds in getting back over the line without being held, children who were touched by the player are eliminated from the game. A player who is caught and held until they run out of breath is eliminated.
Teams take turns sending a player to the opposing side. A player who has not been caught is free to cross back over the line to breathe and then return to try to tag members of the opposite team.
When all players from one team are eliminated, the opposing side wins. Depending on the number of players and the time available, you might play more than one round.