RetroMUD is an LP-type MUD with fully customised areas. There are usually between twenty and fifty players online, depending on the time of day. Role-playing is encouraged, but not mandatory. The MUD is free to play. The game is addictive and can be played for years. Few players have seen everything. The players and staff are friendly and helpful. I recommend RetroMUD to anyone interested in playing with nice people in a beautifully designed universe.