I am looking for the longest (in terms of hours) and most difficult (in terms of complexity).
I’ve played a lot of Final Fantasy, Diablo Series, WoW, Everquest 1 and 2, Skyrim, Divinity Original Sin: 2, etc…
Older gameplay styles are preferred, but not a requirement.
So, what’s the hardest shit out there?


You could get into Dragon Quest games, if you want old school JRPGs. Complexity might be a bit lacking given the era, but doing the old NES ones without a guide is excruciatingly difficult and you can lump on RetroAchevements to add more pain. RA generally adds additional challenges to any older game so you have to play a little min maxing to accomplish them.
I mostly thought of it since RA is beta testing multi sets with DQ9 and getting every accolade might be one of the most insane things I could ever suggest.