Self Portraiture is a single page rules expansion for Shudderspeed that adds a second HP system.

The PDF has a striking, lurid look, washing an old-timey photo in bright red and superimposing white text over it.

Contents-wise, Self Portraiture has you take a photo of your character, and then tear off pieces when you want to counteract bad things happening in the game. This is a really neat and tactile HP system to begin with, but it's especially good for a horror game, and represents an eroding psyche and sense of self.

Overall, I'd absolutely recommend this for Shudderspeed, but I'd also encourage pairing it with any horror system. It's versatile and has a heck of an impact on play.