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I'm going to take two guesses;
1) You have to kill Diablo
2) You have to complete all quests
If the first doesn't apply, then the second should.
Also, just because;
Normal > Nightmare > Hell > Inferno
Edit: What I'm guessing with 1 is, if your friend is in Hell and you're still in normal, they could invite you into a normal Diablo kill, beat him up, and then you unlock Nightmare. Then they could invite you into a Nightmare Diablo, beat him up, and you unlock Hell.
The only problem is that you'll be severely under leveled.
Edited by Culrage#1227 on 5/22/2012 2:44 PM PDT
You only have to kill diablo to unlock the next difficulty (like jadefang said)
Also there is a lvl requirement (to go to hell difficulty you need to be 50, i dont know what it is for nightmare)
Edited by Gorlab#1137 on 5/22/2012 2:48 PM PDT
Does "defeat Diablo" mean defeat him(it? :P) in single player, or is it enough to kill Diablo in public game?
Because I have killed every boss (according to achievements) in nightmare diff., but i still can not enter hell public games, (grayed out)....only hell solo game... kinda annoying, because my Demon hunter is lvl.54,5 and the level restriction for joining public games only allows me to do the "prime evil" quest on nightmare... But I wonder what will happen, when I level up to 55, because nightmare public games only allows players of max. lvl 54... So won't I be able to play on any public games then??? Come on Blizzard....
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