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.

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The Miskatonic University library Outside the city of the Great Race of Yith The archaeological dig
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Cthulhu v1.0 Installer

Cthulhu v1.0 Installer

Feb 23, 2006 Full Version 8 comments

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

Cthulhu v1.1 Patch

Cthulhu v1.1 Patch

Feb 23, 2006 Patch 4 comments

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

Post comment Comments  (30 - 40 of 107)
TheUnbeholden Sep 18 2011, 11:35pm says:

When I go to dig the grave (after killing everyone) at the black church, I see myself floating in the corner of the map and I can see the grave down there and I think its me digging the grave.... but it just remains that way for ever... thats not supposed to be the end is it.. any have any solutions?

+1 vote     reply to comment
TheUnbeholden Sep 30 2011, 1:25am replied:

ah i reinstalled it, along with patch, it works now. Will post a review on it.

+1 vote     reply to comment
pruppets Aug 8 2011, 3:00pm says:

It downloads but then nothing happens? There's no desktop shortcut or anything and I can't make one either? Please help, this mod seems awesome.

-2 votes     reply to comment
Dragonbeon Jul 25 2011, 8:03pm says:

very good mod! kinda scary,but i rate it 10/10 the weapons are very good,was very challenging

+1 vote     reply to comment
Elnakadiaz Feb 27 2011, 12:47am says:

On the house of Ry'leh Cthulhu awaits dead dreaming...
Or something like that since I read it in spanish.

+1 vote     reply to comment
Elnakadiaz Feb 27 2011, 12:46am says:

Epic mod... No words to descript.
This was one of my firsts hl mods and stills on my top 5.
Wondering, where did the Necronomicons power books end?
I would like someone do a fan made MP version.

+1 vote     reply to comment
UniversalBlue Feb 21 2011, 6:46pm says:

Love this mod! Is there a walkthrough some where? I'm afraid I'm lost in Innsmouth and finding it a tad frustrating. I've killed everything I could find so now I can't follow sounds to find anything new.

+1 vote     reply to comment
PhilG Creator
PhilG Mar 30 2011, 3:14am replied:

Whoops - it's been a long while since I checked this page.
The mod comes with a walkthrough text file. It is installed in the mod directory.
Hope this helps!

+1 vote   reply to comment
SUPER_Tank Oct 26 2010, 8:46am says:

Wow! A great mod!

+1 vote     reply to comment
MagikGimp Sep 24 2010, 7:19am says:

Really great mod, play it NOW!

A tough one to start off with so I ended up playing it on god mode which was far less frustrating and a heck of a lot more fun.
If the game crashes change your video settings to software mode until you get indoors again.

+1 vote     reply to comment
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Release Date
Released Feb 2006
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87 votes submitted.

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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, 2:20pm by flippedoutkyrii

Lowest Rated (2 agree) 1/10


Apr 1 2013, 7:13am by Urby

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Cthulhu Cthulhu
Last Update
9 years ago
95 members