The most difficult genre to master the skill of.

[LegitHyperbole]

Jpcc86 said:

For me personally, its bullet hell games, because I find them hard wether im trying to be good at them or even when playing them casually.

They're designed so you have to learn by trial and error which makes them so difficult to master but the more you play the more you feel you've seen this pattern before, ah I'll maneuver this way and that to avoid it. There's only so many patterns they can code into the genre.