Frictional Games' Amnesia: The Dark Descent has sold over a million copies over the past two years. Breaking the math down, Frictional owner Thomas Grip says sales of 1.4 million is the "optimistic figure," since he doesn't think people purchasing multiple copies should count. The game's inclusion with the Humble Indie Bundle and Potato Sack account for many sales and overlap in his estimate.

"Despite that huge number of sales, what I think is more interesting is how good the monthly sales still are. Not counting any discounts, the monthly full price sales lie at over 10,000 units," wrote Grip. "This is totally insane to me. The figures themselves are far beyond any guesses we would have made two years ago. It is also insane, because this number is actually higher than it was around three months after initial launch. That a game can still be going this good two years after is truly remarkable."

Grip concluded his second annual state of Amnesia post by teasing the company's next project, which he says will be a first-person horror game. Grip is hoping to deliver deeper themes with the next project, saying he was disappointed that Amnesia was a "more like a shallow fright-fest." The new game should be available in 2014, but there's no plans to rush it out.