Diablo is, of course, one of the greatest games of all time. And multiplayer is a huge part of the game. That's why it is especially disappointing that in this GOG version, there is a bug that prevents anyone from joining any one else's game on Nightmare or Hell difficulty. This is not a minor annoyance, but an experience-wrecking bug. Now that I am of Nightmare level, I am very disappointed. It is hard to imagine how this could have been released with such a devastating flaw. -Oblaram the Sad Sorcerer
