Comparison of American football and rugby union
A rugby union game is divided into two halves of 40 minutes (or shorter for lower-grade games, and breaks given halfway through each half if playing conditions are considered to be extreme) separated by a half time period of up to 15 minutes in an international match. Most notably, a rugby union game will continue after the scheduled end of a half (half-time or full-time) until the ball becomes dead - any occurrence that would have play restart with a scrum or lineout, or when a team scores. This has led to some "nail-biting" finishes where teams losing by only a small margin work their way towards scoring, and games can go on several minutes over time. Something similar can occur at the end of either half in American football, though usually for only a few seconds of additional time, because a play that begins before the half expires continues until the ball is dead regardless of whether there is any time left on the clock. In both sports, the clock is also stopped during substitutions and for injuries, so the referee does not need to add stoppage time as is done in soccer/Association football. American football games are made up of four quarters of 15 minutes each (less at the high school and youth levels), but the clock stops and starts according to specific rules, so that a 15-minute quarter lasts much longer.
Pro Quarterback
The colors of the team's uniforms are almost the same as the uniforms used in the 1992 NFL season, however. Six different surfaces can be used along with quarters ranging from two minutes to a full 15 minutes. The referee call delay of game penalties in the game when the play clock runs out, the only penalty in the game. There is no other penalties in the game, making offsides and roughing the quarterback into workable strategies. Players are notoriously slow in this game; it is possible for six defensive linemen to catch up with the quarterback and sack him before he is ready to make a forward pass. The announcer will call "interception", when a defensive player catches the ball or "fumble", if the ball is loose during a play. A humorous animation is played after an incomplete pass, interception, or fumble during play selection on the scoreboard.