Do you make your player(s) wear a blindfold when their character(s) are blinded, in darkness, or otherwise cannot see? Earplugs when deafened? I mean, you wouldn't want them to "metagame" by seeing or hearing something their character couldn't have, right?I find that hiding NPC initiative rolls doesn't completely negate the initiative metagame. I had an assassin player who would suddenly change his mind about making a surprise attack if he rolled particularly low for initiative, even though he could not see what the NPCs had rolled. I solved this problem by rolling everyone's initiative behind the DM screen when there was a surprise round involved so that the players couldn't see their own rolls. Metagame negated.