Comparison of Canadian football and rugby union "rouge" and the receiving team gains possession of the ball but give up a point to the punting team for failing to advance the ball out of the endzone. An important difference between the two sports involves the aftermath of a score. In Canadian football, the scoring team kicks off, except after a safety. In rugby union, the team scored upon kicks off (in rugby sevens, a variant of rugby union featuring seven players per side, the scoring team kicks off). Canadian teams have twelve players on the field per side. Different players may be interchanged at will for offence
Canadian football a CFL game. Canadian football is played at several levels in Canada; the top league is the professional nine-team Canadian Football League (CFL). The CFL regular season begins in June, and playoffs for the Grey Cup are completed by mid-November. In cities with outdoor stadiums such as Edmonton, Winnipeg, Calgary, and Regina, low temperatures and icy field conditions can seriously affect the outcome of a game. Amateur football is governed by Football Canada. At the university level, 26 teams play in four conferences under the auspices of U Sports (known from 2001–2016 as Canadian Interuniversity Sport); the U Sports champion