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.

Image RSS Feed Latest Screens
The Miskatonic University library Outside the city of the Great Race of Yith The archaeological dig
Post news Latest News

No news has been posted here. If you have relevant news to share you should post it now.

Downloads RSS Feed Upload file Latest Downloads
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  (50 - 60 of 106)
Duncandhucodename7 May 1 2010, 11:11pm says:

This is the only
HALF LIFE mod I've finished

Thank you very much for uploading I like a lot: D
Especially at the end

+1 vote     reply to comment
Duncandhucodename7 Mar 27 2010, 1:32am says:

My Favorite Mod

+1 vote     reply to comment
Tazmily Mar 21 2010, 6:36pm says:

Keiri doesn't like this game. The final part of his LP was mostly expressing how much he hates the game.

+1 vote     reply to comment
PhilG Creator
PhilG Mar 22 2010, 4:32am replied:

I know, I have been watching his posted videos. While painful to watch, it has been very educational in seeing what works and what doesn't.
One thing that he was definitely correct about though; in several places there needed to be a lot more player guidance. Watching a player wandering around going "what do I do now?" is humbling.
Ah well, lots of other people have said they enjoyed it, which makes me happy!

+2 votes   reply to comment
m82sniper Feb 22 2010, 3:45pm says:

Ah, this was great.

+1 vote     reply to comment
liamnego Dec 30 2009, 3:59pm says:

The one of the greatest H.P.Lovecraft books.

+2 votes     reply to comment
Forking Dec 16 2009, 6:47pm says:

Great mod, full of surprises and puzzles.

+2 votes     reply to comment
nietzschesaurus Oct 27 2009, 10:23pm says:

i love this mod. i've beaten it maybe a dozen times. i think it's time to redownload it and give it another go-through. i hope cthulhu 2 is finished in the not-so-distant future.

+1 vote     reply to comment
flippedoutkyrii Aug 1 2009, 12:57pm says:

A little bugs here and there, but this is an excellent mod!

+1 vote     reply to comment
CdeathJD Jul 22 2009, 2:45pm says:

Looks good, but has a game-breaking bug... after visiting the mansion in the woods and returning to your car, whatever level change is supposed to go off... doesn't!

+2 votes     reply to comment
CdeathJD Jul 22 2009, 3:12pm replied:

Oh, it seems the level change isn't the car itself, but in the bushes at the other side of it, omgwtfbbq!

+1 vote     reply to comment
Post a Comment
click to sign in

You are not logged in, your comment will be anonymous unless you join the community today (totally free - or sign in with your social account on the right) which we encourage all contributors to do.

2000 characters limit; HTML formatting and smileys are not supported - text only

Half-Life Icon
Developed By
Send Message
Official Page
Release Date
Released Feb 2006
Mod Watch
Track this mod
Community Rating



89 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, 2:20pm by flippedoutkyrii

Lowest Rated (2 agree) 1/10


Apr 1 2013, 7:13am by Urby

First Person Shooter
Single Player
Embed Buttons

Promote Cthulhu on your homepage or blog by selecting a button and using the embed code provided (more).

Cthulhu Cthulhu
Last Update
9 years ago
95 members