Call of Cthulhu: Dark Corners of the Earth is a full version first-person horror game developed by Headfirst Productions. The game offers an intense action-adventure experience, with players drawing upon their skills in exploration, investigation, and combat to battle against evil incarnate. The game features a diverse array of levels that range from quaint towns to alien locations, including the Deep One City. One of the most notable features of the game is its dynamic Sanity system, which results in hallucinations, panic attacks, vertigo, paranoia, and more.

The game boasts incredibly detailed real-time graphics with atmospheric lighting and dynamic shadows, contributing to the immersive experience. The gameplay is intelligent and involves puzzle-solving, combat, and exploration. The game also offers a range of 1920s weaponry and vehicles, as well as evil artifacts and alien technology. Fans of H.P. Lovecraft's famous monsters and locations will not be disappointed. Overall, Call of Cthulhu: Dark Corners of the Earth is a must-play for horror game enthusiasts.