Cthulhu is a single-player modification for Half-Life.
It contains 65 maps, 21 new monsters and 14 new weapons.

Aeons ago, Earth was ruled by The Great Old Ones, beings so alien and terrible that merely seeing them would drive most people mad. Before man's ancestors climbed down from the trees, these being were defeated in a war with The Elder Gods.
But their alien nature meant that they could not be slain in any way that we would understand, so they were imprisoned.
And so they wait, patient and potent until the stars are right and they shall walk forth once again and wipe mankind from the face of the Earth.
You play Ranulf Stafford, an occult investigator in Arkham in the year 1928. Drawn into a nightmare chain of events, you find yourself the only thing standing between mankind and the return of Cthulhu, one of the most dreadful of The Great Old Ones.

  • View media
  • View media
  • View media
  • View media
  • View media
Post article Articles

No articles were found matching the criteria specified. We suggest you try the article list with no filter applied, to browse all available. Post article and help us achieve our mission of showcasing the best content from all developers.

Cthulhu v1.0 Installer

9 years ago Full Version 8 comments

This is the installer for Cthulhu: An Unspeakable Mod for Half-Life v1.0

Cthulhu v1.1 Patch

9 years ago Patch 4 comments

This is the v1.1 Patch for Cthulhu: An Unspeakable Mod for Half-Life

Post comment Comments  (10 - 20 of 106)
cahal89 Sep 15 2012 buried:


As a fan of H.P. Lovecraft, I figured I'd give this mod a try. By the time I got to the second area with the house, I was quickly infuriated. You, the protagonist, are given NOTHING to defend yourself with and you will suddenly find yourself being chased (and slaughtered) by cultists and zombies. To top it off, there are no forms of health restoration. This mod is a joke and is unplayable, pass it up and play something that wasn't actually designed to just kill the protagonist and enrage the player.

-7 votes     reply to comment
wida Mar 1 2013 replied:

Ignore this guy. He comments on EVERY mod whining how hard it is.

+5 votes     reply to comment
Luktom100 Feb 17 2013 replied:

Ohh stop whining, not every FPS is a Serious Sam type of a game, just think a little bit. Was the original HL about slaughtering enemies wave by wave ?? You must be one of those COD players if you like brainless simplicity, and no challenge in games Mister :P

+5 votes     reply to comment
Xul Feb 1 2013 replied:

well, isn't there a bit of survival horror? you can obtain some weapons rather quickly and otherwise run away from them if too many are attacking at once

+1 vote     reply to comment
phipe Jan 3 2013 replied:

Cane sword, second floor, pick it up. Kill a cultist and you´ll now have a schmitar too. Another few and soon you got a revolver and a shotgun as well.

If you still haven´t found it i´ll just leave this here.

+2 votes     reply to comment
nietzschesaurus Dec 19 2012 replied:

I got through the game on multiple occasions just find. Maybe you need to brush up on your skills dude. You ever though to just run past the cultist? They stop chasing you after a bit.

+1 vote     reply to comment
fireprowler Nov 16 2012 replied:

you missed the sword didn't you... check the walkthrough if it is too hard for you to find it...

+1 vote     reply to comment
claytonian Oct 13 2012 replied:


+1 vote     reply to comment
TheUnbeholden Aug 1 2012 says:

I’ll admit this can be a chore at sometimes, but in my opinion, this is decent enough to play. It has its boring parts: a maze, fighting on low health and dying all the time (those medkits really should give you more health), timed sequences that are hard to do, or waiting for the flashlight to reload…

Lets start from the beginning: The story. If you know anything about horror, you’ll know H. P. Lovecraft. If not, look it up. You can get his whole works for free off the internet. Even though I haven’t read his stuff, I can tell you that the mod’s story is pretty much in the spirit of H. P. Lovecraft if I learned anything from Call of Cthulhu.. the characters are supposedly from his books although have very little dialogue. Regardless it is an original idea for a mod. But the story is merely a background for the levels, the story tries to interconnect these levels together but they seem rather random when it comes down to it.
Reading the books in the game are the highlight of the mod, and are important to follow this story. The spells are a nice addition although I barely used them.

+2 votes     reply to comment
TheUnbeholden Aug 1 2012 replied:

This mod is somewhat a total conversion. All weapons are changed, and most of the characters. However, you’ll also find some original half-life characters and zombies.. which looks out of place, and also detracts somewhat from the story.
While there where flashlights in 1928, the elevators don’t make much sense in that time period. The only place it belongs,is later on, when you’re in the city of Yith. It’s an advanced civilization, a couple of million year’s ago. While original and in style with the year 1928, the weapons can be a bit annoying too as it takes about 3 headshots with the pistol to take down cultists and their reload times are painfully long.
There are some surprises (Snakes/Big Monsters). Some of the boss fights require some keen observing but the rest is mostly gun fights. I like the uniqueness of the locations even if some levels are way to small… and some like the caves are very bland interiors.
The use of audio could have made the mod way better.

To summarize, I was disappointed but maybe I did like some of it. 5/10

+1 vote     reply to comment
Gameboy555 Mar 10 2012 says:

Good mod but needs patches, such as npc's corpses disapearing, as if you kill an npc in front of a door it would make it impossible to open the door plus it may interefere with cutscence progression, plus the difficulty of the mod even on easy was a bit impossible, but just little changes will make the mod perfect. I love this mod though

0 votes     reply to comment
Qwertyus Jun 28 2012 replied:

Doors' blocking by the corpses - is a Half-Life engine bug and can't be fixed with any patches in any mod... Try do not to kill in doors, or smash the body with knife into gibs.

+1 vote     reply to comment
Cthulhucultistdani Jan 29 2012 says:

Hey, i need help in installing this. I bought half-life on steam just to play this.

+1 vote     reply to comment
Qwertyus Jun 28 2012 replied:

Install it in separate /cthulhu folder inside your game folder, not directly in your HL folder.

+1 vote     reply to comment
briggswag Feb 5 2012 replied:

I didnt download but if its the installer installer it to c:\ programfiles\ steam\steamapps\ username\ half-life and if steam is running restart it and you should have the mod on your games list. I hope this helped

+1 vote     reply to comment
Post a comment

You are not logged in, your comment will be anonymous unless you join the community. Or sign in with your social account:

Send Message
Release date
Released 2006
Mod watch
Start tracking
Community Rating



95 votes submitted.

You Say


Ratings closed.

Highest Rated (5 agree) 10/10

An incredible mod from start to finish.

Among my favorite half-life mods of all time. :)

Jun 7 2011 by flippedoutkyrii

Lowest Rated (2 agree) 1/10


Apr 1 2013 by Urby

Embed Buttons
Link to Cthulhu by selecting a button and using the embed code provided more...
Last Update
9 years ago
97 members