Shadow of the Beast II for the Amiga. Even if you used the "Ten Pints" cheat code you could still go the wrong way and have to restart.

F-Zero GX and Super Mario Bros.: The Lost Levels.

Iv beaten the later and am working hard on F-Zero GX, Iv beaten Medium and Hard, now all thats left is very hard.

Wow, your crazy, crazy good!

Battletoads!

i owned super ghouls and ghosts and NEVER finished the 1st level. LOL i was only like 4 or 5 at the time though haha though i don't think i would fair any better today.

what about donkey kong

Contra? I hope you don't mean the first one on the NES. That was fairly easy after playing a few times but the sequel Super C is much harder. Some extremly hard games that I found nearly impossible were Friday The 13th, Batman and the Ninja Gaiden series, all on the NES. I only beat Friday The 13th and Ninja Gaiden II with the help of Game Genie.

Well our of the ones I know: F-Zero GX, Battletoads, and Super Mario Bros: The Lost Levels.

Magician Lord, people.

The vid is of part 2 of a perfect runthrough. Trust me, though, to do what this person did is beyond madness

NES is the king of Hard games on consoles:

Battletoads - The game is really about memorization in some levels, and some mad skillz in others, the thing is, it all combines in a phreaking hard game, so hard that i'm the only one in my neighborhood to ever finishing it without a game genie, i remember so much pain in my thumbs, all lives and continues gone, only 1 left with the last boss, somehow i managed to beat her, and got to see THE ENDING THAT NO ONE DESERVES, and i really mean it, if you see it in youtube you will say "this is not bad, it's a typical NES ending", now play the game and tell me if that ending was good enough for that really hard game...

BTW, the REALLY FUCKED UP CO-OP MODE, if the single player was hard, you don't want to know about the 2 player co-op...

Ghosts & Goblins - My favorite company Capcom did a really phreaking hard game, really bad controls (especially the jumps), the epic armor that vanished after guess what: 1 HIT, if you pick the fire weapon, you might be dead as well, and if you're turned into a frog, bad news for you, all of that to face enemies that move really weird and in random directions, and guess what??? if you manage to pass all the levels, you return to the 1st one to do it again... and the ending, if the Battletoads one was not good enough, this one is just pure shite...

Metroid - I know what you're thinking, Metroid is not that hard, and you know what, it's not, i finished it without a sweat, but the difficulty is not in the game, is in HOW FAST CAN YOU DO IT so you can see for the 1st time SAMUS IN A BIKINI, back then i didn't knew, i finished it and i saw Samus waving, i was pissed off until a friend said to me "finish it faster", when i got to see that Samus was really a woman, that was really great, but it's really hard to finish the game in an hour or less (BIKINI SAMUS)...