Box lacrosse The roots of indoor lacrosse are obscure, but its invention has been attributed to one Paddy Brennan, a field lacrosse player and referee from Montreal, who, being annoyed by the constant slowing of play from balls going out of bounds in the field game, experimented with indoor games at the Mount Royal Arena during the early 1920s. Joseph Cattarinich and Leo Dandurand, owners of the National Hockey League's Montreal Canadiens in the 1920s, led the participating ice hockey arena owners to introduce the new sport. In the 1930s, 6 v 6 indoor lacrosse came to be played in the summer
Field lacrosse identical, the game play and rules are different". Professional field lacrosse made its first appearance in 1988 with the formation of the American Lacrosse League, which folded after five weeks of play. In 2001, professional field lacrosse resurfaced with the inception of Major League Lacrosse (MLL), whose teams, based in the United States and Canada, play during the summer. The MLL modified its rules from the established field lacrosse rules of international, college, and high school programs. To increase scoring, the league employed a sixty second shot clock, a two point goal for shots taken outside a designated perimeter, and