If any game is poorly rendered, with a thick fog, and dark graphics, it will have a creepypasta made of it. PS1 based horror games follow this formula, for instance. Early editions of minecraft fall under this definition as well. This law is related to the phenomenon of liminal spaces, though it is limited to video games, especially older games. These games also tend to be 3d titles, though they do not always have to be as such. Other games with a generally unfitting creepy/unfinished atmosphere also follow this law, such as gmod's gm_construct, or pokemon's lavender town.
noun
"Herobrine is so lame, dude. How did it even catch on?"
"Ebola's law, my dude. Ebola's law."
"Fuck me, Gm_construct is unsettling. It makes for a good example of Ebola's law, though."