[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/cthulhumud.jpg]]
''Cthulhu MUD'' is one of many MUD (Read:Multi User Dungeon, essentially a text-based MMORPG) games, this one with a (surprise!) Franchise/CthulhuMythos theme. While a bit more slash-happy than most investigator-style Lovecraft [=RPGs=] (say TabletopGame/CallOfCthulhu ) it nevertheless stays true to [[Creator/HPLovecraft Lovecraft's]] original works. Like most [=MUDs=], it is easy to join and free-to-play, but with a learning curve. An Urban Fantasy with all the Swords and Sorcery (and [[EldritchAbomination Eldritch Abominations]] and BlackMagic), but in a distinctly Lovecraftian setting.

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!!Tropes Include:

* AlienAmongUs - Alien player-characters will spend a lot of time in Human areas, and everybody except a number of law-enforcement officials will treat you as another human.
* AncientAstronauts - You can play as one.
* BecomingTheMask - The Mask Self spell (necessary for an Alien avoiding attention from the local police) will literally turn you into the target creature as far as the game in concerned, even limiting what equipment you can use and changing you name in chat.
* {{Cult}}s - You can fight them or join them. Typically a ReligionOfEvil in the CosmicHorrorStory sense.
* DreamLand - The original Dreamlands of Lovecraft. And you [[ExactlyWhatItSaysOnTheTin actually get there by dreaming]].
* JackOfAllTrades - Humans can pick from nine starter professions, while the other races are limited to one or two. Of course, all races can change professions later.
* {{Magitek}} - Traditional magical spells and sorcery side-by-side with [[EnergyWeapon energy weapons]] and [[PoweredArmor tripolymer]] armor, though the presence of magic may be justified by [[EldritchAbomination Elder Gods]] being invoked and, psychic powers and the scientific artifacts of lost races. Oddly, the magic is often even "more" effective.
* [[PublicDomainCharacter Public Domain]] - with entire areas based on HPL stories (and those of Mythos writers in the same period) which would not get away with it otherwise.
* SanitySlippage - Looking at the wrong creature - or even being in the same room as it - will often knock a few points of the sanity score.
* SquishyWizard - Yithians, who spend a lot of time in others' bodies anyways. Keep in mind they are slug-cones with tubes and tentacles rather than regular High-men wizards, but they fill the same role.
* WizardingSchool - Miskatonic University, as well the Temple in Ulthar.
* YouCantGetYeFlask - Alas, you cannot go that way.
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