Frictional Games’ Amnesia: The Dark Descent is currently available for free on Steam.

The game originally released back in September 2010 and currently has an Overwhelmingly Positive rating on Steam from nearly 10,000 reviews. Two years after the game was released, it celebrated its one-millionth sale, which is quite the achievement for an indie game.

Amnesia: The Dark Descent is a first-person survival horror game that has players assuming the role of Daniel as he awakens to find himself inside of a desolate castle. As you could expect from the title of the game, Daniel doesn’t remember anything about his past and he needs to figure out not only what he’s doing in the castle, but he also needs to combat the horrors the come from both outside and within his own mind.

Amnesia: The Dark Descent will only be available for free for the next 24 hours, so be sure to grab it as soon as you can if you’re a fan of horror games, or else you'll need to pay $20 bucks for it.