For 30 years, the National Football League (NFL) has mandated sudden-death overtime to decide games that are tied after 60 minutes of play. The first team to score in overtime wins the game. If neither team scores at the end of 15 minutes of overtime, the game ends in a tie.
A coin flip determines which team gets the ball first. The winner of the toss can choose whether the team wants to receive the ball and begin an offensive series or pick a goal to defend.