Sad Satan is a 2015 horror video game that was allegedly made by someone nicknamed "ZK" on the dark web. In the game, the player walks through dimly lit hallways in a first-person view while getting periodically interrupted by images that flash on the screen. Also, various audio samples can be heard in the game. There are no goals or win conditions.
Speculation claims that Sad Satan was actually created by the same person who first played it: Obscure Horror Corner. The claim states that Jamie made the game to be famous. Sad Satan did achieve fame as it became popular with YouTubers' reactions.