The original Mega Man is really hard, Castlevania I was not a walk in the park but the rest of the games (II and onwards) were pretty "easy". Original Metroid is really hard in the beginning before you get more energy containers.
Ghosts and Goblins is hard and frustrating, I was never able to play it all through. I've just tried Ghouls and Ghosts for a few sec so I don't know haow hard it is in comparison with the original.
Since I suck on shooters I have to add Xevious, I never got further than to the first boss, well, and R-type, and hundreds of other shooters :)
Edit: and yes, as mentioned numerous times before in this thread Ninja Gaiden. In Sweden (the whole Europe maybe?) it was retitled Shadow Warriors because everything including the word Ninja was too evil to sell to kids. :)
Beware, I live!
I am Sinistar!
Beware, coward!
I hunger!
Roaaaaaaaaaar!
