Cult video game
From The Art and Popular Culture Encyclopedia
A cult video game is a video game that does not possess mainstream appeal. Cult does not mean that such a game has a dedicated fanbase, but instead that the game's design is so different that only people with a certain taste show interest. This often heightens the game's appeal to certain non-gamers.
Cult video games are often developed by Japanese game developers, with the difference between the culture of Japan and Western culture contributing to such labeling. However, many cult video games are considered out of the ordinary by Japanese standards, as well.