People have already mentioned The Dunwich Horror (a personal favourite), but I'm going to bring it up again because this is GOG. See, The Dunwich Horror t's especially notable from the context of games: it introduced the idea (popularized by Chaosium's Call of Cthulhu tabletop RPG) of men and women actively researching to outsmart and perhaps (who knows?) combat That Which Cannot Be Known. If you want to see how gaming has taken the Mythos, that is an excellent way to start.

That´s not totally true, Ethernal Darkness was "inspired" by the Cthulu myths, they created a similar universe with ancient (but much, much more less) deities; but the first Alone in the Dark was based on the Lovecraft universe, they mentioned during the game books like De Vermis Mysteriis (this one you find it in a hidden room and die if you dare to read it without protection) and the Necronomicon, they also explain in a text that the name of the mansion "Derceto" was named after Shub-Niggurath (it was one of her many names) and so... The second and third Alone in the Dark have nothing to do with Lovecraft.

Not to be a ass here mate but did you read what I said? I said "another game that drew inspiration from lovecraft was Eternal Darkness" So how the bloody hell do you say that I'm wrong and then say that "Eternal Darkness was inspired by the Cthulu mythos?" which was the same thing I said just worded different?

Lovecraft is one of the greatest authors who ever lived. Also, because he lived such a long time ago, you can get his work free from the internet LEGALLY. If you want to start reading, the first things you should read are "Call of Cthulhu", "Dagon", " At the Mountains of Madness", "The Colour out of Space" and "The case of Charles Dexter Ward". Those are his best, In my humble opinion.

Since you are capable of reading, I strongly recommend reading this
http://www.gamersgate.com/DD-DARK/darkness-within-in-pursuit-of-loath-nolder
It's a game, yes, but the majority of the story comes from letters, diaries and other texts. Underlining clues is necessary to progress anywhere in the game. It also creepy and borrows a lot from Lovecraft (including non-Cthulhu works).

Mind, you won't find that many games based primarily on his writings... There's a curse. Most development studios close their doors before their HP-inspired game even hits the shelves. Those who survive that, suffer afterwards.

Mandatory post about the best Cthulhu game ever made.

The second Darkness Within is not that good... starts nicely though. GG version shouldn't even be downloaded (unpatchable): if you buy it, find a torrent with the retail version. That one will update lovely.

Necronomicon is "meh". Very "meh". Better look into Call of Cthulhu on Steam.

I'd also throw in there "The Shadow over Innsmouth"

No, I was referring to this statement

"Alone in the dark was inspired by the cthulu mythos nut not based on it"
That´s why I said "not totally true", it was partially true (or false) because Ethernal Darkness was inspired in th Cthulu Myths, but Alone in the Dark is based on them.

My personal favourite story would be 'The Shadow over Innsmouth'. If you plan to play 'Dark Corners of the Earth' (and you really should, it's probably the best Cthulhu videogame ever made) I'd recommend reading it first. Yes, it somehow will 'spoil' some of the events in the game, because the starting section draws heavily from it, but it will also help you to know instinctively what to do at some points - i.e., you'll probably close all the doors in a certain hotel before going to sleep, and that will help you a lot in the next 'infamous' sequence...

The second best Cthulhu videogame is, always in my opinion, 'The Shadow of the Comet'. It's an old point and click adventure that, again, draws some ideas from 'The Shadow over Innsmouth'. The protagonist is a photographer sent in 1910 to the coastal town of Illsmouth to take pictures of Halley's comet. But, of course, there's a dark secret in the town and its inhabitants, and the last scientific who witnessed the passing of the comet, seventy-odd years before, ended his days in an asylum as a raving lunatic.

At the Mountains of Madness was great..

Agreed:) Also "The Alchemist" was very good.

Arkham Asylum was epic.

Vikings of Midgard has a very funny version of Cthulhu.

[url=http://rpg.hamsterrepublic.com/ohrrpgce/Game:Vikings_of_Midgard]http://rpg.hamsterrepublic.com/ohrrpgce/Game:Vikings_of_Midgard[/url]