I mean, ik theres probally harder games but, for me, Geometry Dash its something that it dosent have to be ignore if we are talking of dificulty.
theres 7 types of dificulty
Auto
Easy
Normal
Hard
Harder
Insane
Demon
And the last one, has other 5 types
Easy Demon
Medium Demon
Hard Demon
Insane Demon
and the highest dificulta yet
Extreme Demon
this is the one who has the most challenging levels in all the game, theres a lot, and I mean a L O T of levels for example.
as:
Yatagarasu
Bloodbath
Cataclysm
Acropolis
Ouroboros
The Yandere (yes, theres a lvl with that Name)
etc, etc...
aaaannd we dont finish there, no!
cuz theres even a Extreme Demon List, where the top 10 is a damm chaos ._.
like...
The Golden
Firework
and the top 1... (as I remember right now)
Slaugtherhouse
I think thats enought for this, so yeah, thats it.