Neodegenerate on 01 May 2017
Most all of the more difficult games I have beaten were back in my childhood on NES.
TMNT
Castlevania 1-3
Double Dragon 1-3
Ninja Gaiden 1 and 2
Metroid
MegaMan 1-3
Zelda 2
I feel like I beat Battletoads at one point, but I might've just watched my brother do it. He is much better than I am at pretty much all video games.
Someone mentioned Vagrant Story, not sure I would classified that one as difficult but if so, throw it on my list here too.
