I had never heard of this game/mod until a little while ago on a youtube video. From that small youtube clip, I got freaked out. Now, watching people play a horror game for the most part isn't scary at all but if a game can instill a sense of fear in me from just watching someone play, it deserves some attention.
Nightmare House 2 is a free, horror-themed first-person-shooter game, and the direct successor of the first classic horror map pack "Nightmare House". Nightmare House 2 is based on the Source Engine by Valve, also considered a modification (mod) made for Half Life: Episode 2.
The story resumes with the player lost and confused in a hospital known as "Never Lose Hope". With no understanding of how you came to be there, there's only a vague memory of the mysterious, haunting girl from Nightmare House. Soon it will be difficult to determine between a dream and reality. How long will it take you to realize that escape is not an option?
All Nightmare House related content is free of charge, and is available in this section. Each of the playable downloads includes a readme.txt inside, with instructions about installing the game properly.
Nightmare House 2 is available for download, and requires Half Life 2: Episode 2 with a registered Steam client to run it. If you run into any trouble, or mind to share your experience in general, hit the our official forums.
The game is free to do download on their site. I'll try it the moment I get off from work and try to broadcast it if my laptop can hadle it.
Here is the video I was talking about;