Massively points out that today marks the 30th anniversary of the first Multi-User Dungeon (MUD) going live at Essex University in the UK. The game, referred to as MUD1, was created by Roy Trubshaw. Richard Bartle, a man who also worked on the game as a student at Essex, has a post discussing the milestone and talking about how MUDs relate to modern MMOs. What MUDs did you play?