single user MUD-type text adventure

Considering that MUD stands for Multi User Dungeon, what exactly is a "single user MUD-type text adventure"? How is it different from a "single user text adventure", or just a "text adventure"?

In reply to Re: Sometimes, the simplest things will trip you up, if you forget about them by Anonymous Monk
in thread Sometimes, the simplest things will trip you up, if you forget about them by matra555

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