There were big problems with the Diablo II realms over the weekend. Someone figured out an exploit that allowed them to access any character stored on the server, as long as they knew that character’s name. Needless to say, everyone listed on the ladder was raided immediately. Ironically, Blizzard came up with the idea of storing characters online in order to make the game fairer by securing character data so that people couldn’t hack on their characters locally and then use them to play online.