British Legends & MUD1
British Legends (BL) was an early commercial version of the very first MUD ever, created by Richard Bartle and others at Essex University, way back when. BL ran for about a decade on CompuServe, back when CompuServe was more a BBS than an Internet provider. BL was a rather small MUD by modern standards, but it shines because of its ingenious puzzles, its finely tuned balance and its lethal atmosphere. Yes folks, BL was a Player Killing MUD. BL was very popular in its day but was discontinued when CompuServe went Internet.
Happily, BL has been reincarnated on the Internet as MUD1. It runs on Viktor's site, free of charge and practically unchanged from the original.
This was my summary. Here are some links to further information: