Slender: The Eight Pages, formerly known as Slender is a free experimental game developed by Parsec Productions. It was released as a beta in June 2012 for Windows and Mac OS X.

PublicSeaLion says

10/10 - Agree (3) Disagree (1)

I know this game is overrated, I know the graphics are meh, but it's the way it is able to genuinely horror the player that makes this game excellent. This game was so scary it has inspired dozens, if not hundreds, of spin off games. The simple yet effective formula for gameplay is now being used in TONS of games. This game laid the framework for a new set of horror games and that is why I believe it deserves a 10/10