My cousin once told me she got up to round 94 or so on Duck Hunt. She had the gun right up against the screen so I guess it wasn't really that hard. She didn't lose though, her mom turned it off and told her to go outside before she turned into a zombie. I guess that means it's possible to get up to round 99. Who knows what happens after that.

I never beat Mega Man 1 until about a year ago. That is by far the hardest Mega Man game. I only beat it because of the pause glitch that makes some of the weapons apply more damage.

Come to think of it, I never beat Who Framed Roger Rabbit or Bart vs. the Space Mutants either. Those games I hardly ever played though.