the team perceives as a dirty hit. Amateur recreation level players who play strictly inline hockey never consider fisticuffs a legitimate behavior. The amateur game penalizes fisticuffs more harshly, as a player who receives a fighting major is also assessed at least a 10-minute misconduct penalty or a game misconduct penalty and suspension. Most local recreation leagues also suspend or ban players who engage in fights. Periods and overtime A professional game consists of two halves of twenty minutes each, the clock running only when the puck is in play. The teams change ends for the second half, and again at the start of each overtime played (playoffs only; same ends as the second half otherwise). Some leagues such as the American Inline Hockey League (AIHL), recreational leagues and children's leagues often play shorter games, generally with two shorter periods or three running clock periods of play. Various procedures are used if a game is tied. Some leagues and tournaments do not use an overtime, unless a "winner" must be determined, such as in tournament pool play and league regular season. Others will us either one, or a combination of; sudden death overtime periods, or penalty shootouts. Usually up to two 5-minute sudden death overtimes are played; if still tied, penalty shootouts. Playing surface Indoor inline hockey is played on any suitable non-slip surface. While converted roller rinks may use wooden floors, dedicated inline hockey facilities use Sport Court or similar surface, which allows maximum traction to inline hockey wheels whilst providing a smooth, unbroken gliding surface for the puck. The playing area should be surrounded by full boards similar to ice hockey with glass or fencing to a height of around 2m. Often, especially in European countries, the game is played in indoor sports halls, on wooden floors. Therefore, there will be no standardized boards but instead the perimeter of the playing surface will be brick walls. In such cases, the corners of the hall are rounded off with added curved boards. Variants Inline sledge hockey Based on Ice Sledge Hockey, Inline Sledge Hockey is played to the same rules as Inline Puck Hockey (essentially ice hockey played off ice using inline skates) and has been made possible by the design and manufacture of inline sledges by RGK, Europe's premier sports wheelchair maker. There is no classification points system dictating who can be involved in play within Inline Sledge