must completely cross the goal line with 0.1 seconds or more remaining on the clock in order for the goal to count; if the period expires (the exact moment when the green goal light comes on at 0.0 seconds) before the puck completely crosses the goal line, the goal is disallowed. Football In Australian rules football there are kicks after the siren, where a mark or free kick awarded just before the end of a quarter may be kicked as the final action of that period. In Gaelic football play is extended to allow for the kick of a free kick or puck awarded prior to the end of a half. In gridiron football, a touchdown after time expires or a field goal (or, much more rarely, a successful fair catch kick in American football or an open-field single point in Canadian) kicked as time expires can be described as a "buzzer beater," though no actual buzzers are used in that sport. More generally, in all codes, if a play (whether or not involving a kick) is in progress at the time the clock expires, play continues until the ball is dead. (In American football, the snap on the buzzer-beating play must take place before the clock expired, except if the defense commits a foul on the last play, in which case an untimed down is added. In Canadian football, a play can and must be executed even if the clock expires after the previous play but before the snap.) Several important games have been decided on the outcome of buzzer beaters, such as Super Bowl XXXVI and Super Bowl XXXVIII, both of which were decided on successful kicks by Adam Vinatieri; in contrast, Scott Norwood's infamous missed kick in Super Bowl XXV decided that game in favor of the opposing New York Giants. A related concept in football is the Hail Mary pass. In rugby union the game does not end until the ball goes dead after time has expired – therefore if a side trailing by less than one score can maintain possession and keep the ball in play they have a chance of victory. A rule change in 2017 amended the rules so that if a penalty is awarded the ball can be kicked out and a line-out taken, even if time has elapsed. The rules in rugby league also allow for play after time has elapsed;