Slender: Source

Then don’t even consider System Shock 2 or, even scarier, Amnesia: The Dark Descent.

It’s better than F.E.A.R.

don’t get me started on DOOM 3

That game is in my all-time top 5 favorites. Nice try, though.

Fatal Frame, nuff said.

Nuff said, indeed

I played the original Slender recently. It’s not that it’s scary; it’s just really really hard. Like, I could never get any more than 3/8 pages.

It is sooo scary. It’s based off the same system Amnesia is based off: Since you never actually see Slenderman up close, your mind immediately replaces him with the scariest thing it can think of.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.