There are a few reasons a player may leave a kickball game:
IMPORTANT: The rules of substitutions in kickball will vary based on the level of play and the rules defined in the rulebook for the league you're playing in. These tutorials are meant to give you a basic understanding of the game. Be sure to read your league's rulebook to confirm any details suggested in these tutorials.
A substitution is the act of replacing a player on a kickball team with another player from the same team. Any time a substitution is made, the kickball is declared dead by the Head Referee and baserunners cannot advance.
Pitcher And Catcher Substitution
Some leagues define in the rules that baserunners can only be substituted at most two (2) times per game.