[Mourningfall]

4 difficulties though, so there's 120 charts, plus the challenge modes (nano-targeter, mix-up etc) push it to well over 200 different charts to play.

I'll admit it can be a slight grind finding the modules you want but there are modules that increase your chances of obtaining new ones or rare ones so that saves alot of time

and it's stupidly fun so it doesn't even feel like a grind. I rarely spend more than a few hours on anything a week, but in the first 3 days of miku I played 30+ hours, suprisingly addictive tbh