The NFL operates under sudden death overtime rules where the first team to score in a 15 minute overtime wins. Regular season games can end in a tie while post-season games can not. There is no limit to the number of overtimes in College Football and the team with the most points at the end of an overtime period wins. If the teams are still tied at the end of a period, another overtime period begins.
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No. A Basketball game cannot end in a tie, therefore, the teams will play as many overtime periods as needed to break the tie.