If you've heard of the Amnesia games before, then you've probably also heard that they're scary. I've certainly come across several claims that they are the "scariest games of all time" and even a few people have suggested that the games are too scary to complete. The success of the first game in the series, Frictional Games' 2011 Amnesia: Dark Descent, was contingent on its terrifying nature; its cat and mouse chases featuring in a hundred Let's Plays and streams, where grown adults hid in corners, faced the wall and whispered to themselves repeatedly that "everything is going to be OK".
There's a reasonable argument to be made that Amnesia: The Dark Descent is one of the most influential games of this decade. Like Minecraft and Dark Souls, the ideas and systems explored in Frictional's masterclass in terror have crept out into other areas of the games industry, like a virus seeking out fresh hosts.
You'll probably never happen across a person raving about a survival horror game by saying how hyperactive their amygdala was, and how their rostral anterior cingulate cortex was powerless to dampen the emotional stimuli.
I think a mark of quality in a game is whether you can return to a room you've previously been in, and know you were there earlier by the destruction you wrought. Amnesia, the new first-person adventure from Penumbra developers Frictional, does not paint rooms in the blood of your enemies, but rather in strewn desk drawers, boxes and broken glass.