Call of Cthulhu: Dark Corners of the Earth

Summary pulled directly from Steam - Some text may only be applicable to Steam platform

Call of Cthulhu: Dark Corners of the Earth is a first-person horror game that combines intense action and adventure elements. You will draw upon your skills in exploration, investigation, and combat while faced with the seemingly impossible task of battling evil incarnate.

Key features:

Diverse array of levels from quaint towns to alien locations, including Deep One City
Dynamic Sanity system resulting in hallucinations, panic attacks, vertigo, paranoia, and more!
Incredibly detailed real-time graphics with atmospheric lighting and dynamic shadows
Intelligent gameplay involving puzzle solving as well as combat and exploration
1920s weaponry and vehicles as well as evil artifacts and alien technology
Lovecraft's famous monsters and locations