You go through a series of rugby league related trials - mostly trivia related, or tipping various aspects of upcoming matches. The winning tribe gets immunity - the others PM the host with their vote, and by the next round of the NRL competition, there's one less person on the island.
And don't be fooled - there are alliances, just like in real life. And just like in real life, not everyone remembers that it's just a game.
I had a lot of fun, might be better to let other and newer members have a go wb, and anyway someone has to put up their hand to be the host. I did help with one challenge after i was voted off and it was good fun, but to do it for however long, i just don't have the time. Ians was a good host maybe he'll have another crack.