popular and common ice hockey nets. Game While the general characteristics of the game are the same wherever it is played, the exact rules depend on the particular code of play being used. The most important code is that of the Comité International Roller In-Line Hockey (CIRILH), an organization and discipline of the Fédération Internationale de Roller Sports Inline hockey is played on an inline hockey rink. During normal play, there are five players per side on the floor at any time, one of them being the goaltender, each of whom is on inline hockey skates. The objective of the game is to score goals by shooting a hard plastic disc, the puck, into the opponent's goal net, which is placed at the opposite end of the rink. The players may control the puck using a long stick with a blade that is commonly curved at one end. Players may also redirect the puck with any part of their bodies, subject to certain restrictions. Players may not hold the puck in their hand and are prohibited from using their hands to pass the puck to their teammates, unless they are in the defensive zone. Players are also prohibited from kicking the puck into the opponent's goal, though unintentional redirections off the skate are permitted. Players may not intentionally bat the puck into the net with their hands. The four players other than the goaltender are typically divided into two forwards and two defencemen. The forward positions consist of a center and a winger. The defencemen usually stay together as a pair generally divided between left and right. A substitution of an entire unit at once is called a line change. Teams typically employ alternate sets of forward lines and defensive pairings when shorthanded or on a power play. Substitutions are permitted at any time during the course of the game, although during a stoppage of play the home team is permitted the final change. When players are substituted during play, it is called changing on the fly. The boards surrounding the floor help keep the puck in play and they can also be used as tools to play the puck. Players are not permitted to "bodycheck" opponents into the boards as a means of stopping progress. The referees and the outsides of the goal are "in play" and do not cause a stoppage of the game when the puck or