American FootballThe gridiron game — America's most-watched sport, from Friday nights to the Super Bowl, now Olympic-bound as flag football at LA28.
Australian Rules FootballAustralia's own code — 18 a side on an oval, no offside, six points a goal and one a behind, with the AFL Grand Final at the MCG.
Canadian FootballThree downs, twelve players and a bigger field — the northern gridiron code, played for the Grey Cup since 1909.
Gaelic GamesIreland's amateur national sports — Gaelic football, hurling and camogie, played by county teams, with the All-Ireland finals at Croke Park (capacity 82,300).
RugbyThe handling code of football — 15-a-side rugby union, Olympic sevens, and a World Cup heading to the United States in 2031.
Rugby LeagueThe thirteen-a-side rugby code, dating from the 1895 split in English rugby over broken-time payments, governed internationally by International Rugby League and played in Australia's NRL and Europe's Super League.
SoccerAssociation football — the most popular sport on Earth, played in every country under one set of laws and one world governing body.