The rules is simply. The host clear the whole act and drop some powerfull legendary somewhere. Then the host invite 3 member who will be the players. Their task is find those legendary and who is the first he get all legendary. While you can make another game = bet game where another people can bet who will find the legendarys.
(and there is no rules you can use skills to go faster( teleport etc.) and + mov speed on items. )
Bump if you like it.