This comparison of rules has been prepared to aid players and fans in their understanding of the game. It is not meant to be a substitute for the official rules. In any case of conflict between these explanations and the official rules, the official rules always have precedence. While the NFL Europe doesn't enjoy the popularity that football does in the U.S. and Canada, it is a growing sport in these other nations, with an ever increasing following. The teams in the NFL Europe are still made up largely of American players, and the rules are basically the same as for the NFL in the America.
Field size is an immediate difference between leagues.
Also, the NCAA uses two supports for goal posts, while the NFL has only one. In the CFL, the field is a total of 150 yards by 65 yards, having two 20-yard end zones, for 110 yards of playing field. Arena football is, as the name suggests, played in an indoor arena. Goal posts are nine feet wide, with the crossbar at 15 feet. This small size is the opposite of the Canadian game, and while the running involved in the CFL ignites many fans' passions, those who advocate Arena football claim that the tighter field makes for a faster-paced game with more blocking action and more aggressive play.