Australian rules football – officially known as "Australian football", and informally as "football", "footy" or "Aussie rules". In some areas it is referred to as "AFL", the name of the main organising body and competition Auskick – a version of Australian rules designed by the AFL for young children Metro footy (or Metro rules footy) – a modified version invented by the USAFL, for use on gridiron fields in North American cities (which often lack grounds large enough for conventional Australian rules matches) Kick-to-kick – informal versions of the game 9-a-side footy – a more open, running variety of Australian rules, requiring 18 players in total and a proportionally smaller playing area (includes contact and non-contact varieties) Rec footy – "Recreational Football", a modified non-contact variation of Australian rules, created by the AFL, which replaces tackles with tags Touch Aussie Rules – a non-tackle variation of Australian Rules played only in the United Kingdom Samoa rules – localised version adapted to Samoan conditions, such as the use of rugby football fields Masters Australian football (a.k.a.