Nevermind

[Frost]

http://www.nevermindgame.com/

In Nevermind, you play as an employee of the Neurostalgia Institute tasked with uncovering the mysteries hidden within the repressed memories of trauma victims. The game places you in situations that range from the unsettling to downright disturbing - like any good horror experience. The catch, however, is that you can play it while wearing a GARMIN heart-rate sensor. As a result, the more scared you get, the harder the game becomes - and, conversely, as you calm down, the game will gradually return to its easier, gentler default state.

Just thought I'd share.