Comparison of American football and rugby union football, except high school (all but Massachusetts & Texas), allows conversion turnovers that are returned for touchdowns to be given 2 points. In American football teams often opt to go for a field goal (worth 3 points) rather than attempt a touchdown, either because it is fourth down and they don't want to risk a turnover or because it is late in the game and the three points will either tie the game or put the team ahead. The rugby equivalent is a drop goal (worth 3 points). The key difference between a field goal and a drop goal is
Comparison of Canadian football and rugby union is not permitted in rugby union and would be considered 'obstruction', resulting in a penalty. A touchdown is the Canadian equivalent of a try. Unlike Canadian football, both codes of rugby require the ball to be grounded, whereas in Canadian football it is sufficient for the ball to enter the end zone (in-goal area) when in the possession of a player (making the term "touchdown" a misnomer). In Canadian football a touchdown scores 6 points; in rugby union a try is worth 5 points. In both games, following a try / touchdown, there is the opportunity to score additional points