Speedball is a game in which players are divided into two teams.  The teams are placed on opposite sides of a field filled with bunkers and other objects to hide behind.  There is a flag in the middle of the field.  The object of the game is for one team to get the flag and then cross over to the other teams starting line.  Both teams start at the same time and work their way towards the flag.  As players are hit they are out of the game and have to go off to the side.  If a player is hit while carrying the flag, the flag is usually placed on the spot where the player was hit.  After the flag man is out, the flag is then neutral and any team can get it.  The games usually last 10-15 minutes depending on the number of players and the field.