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Press & Hold Back...If your symbol appears first,& You have the ability to be blown away by explosives.these are signs that you have host...
What you do is you hold down the back button until the games starts and the first person that doesnt have the red X over there symbol is Host and there can be times where it is really hard to figure out who is host.
well if you have the choice to press a to start a game, or go over to change game options, then thats pretty indicative.... also hold back when it loads the game and youll see
usually its when its your party in a custom.