There are 4 main versions of Gridiron Football: the traditional 11v11 game played in USA, a 12v12 version of the game played in Canada, and a 8v8 version of the game played Indoors on converted Ice Hockey Arenas.
 Professional Football Researchers Association (2011) “No Christian End!” The Early History of Professional Football. pg. 23-32. PFRA Publications. Connecticu
Picture Credit:  Kids Encyclopedia facts | Kiddle (2019) Canadian Football League League facts for Kids [Internet] Available from: https://kids.kiddle.co/images/a/a3/CFL_Logo_1960%27s.png [Accessed 9 June 2019]
The Interprovincial Rugby Football Union (IRFU), the Big Four (Hamilton Tigers, Toronto Argonauts, Ottawa Rough Riders and Montreal Football Club), The Grey Cup was donated in 1909 by the Earl of Grey, for which only Canadian Rugby Union members may play for. The CFL’s version of the Super Bowl, and since the 1950s has been in the sole possession of the CFL, when the sport broke away from the Canadian Rugby Union and formed its own League, with the Cup dating back to the late-nineteenth century.
Canadian Rugby Union (1909-1956)
Canadian Rugby Union 1909-1956