3 of NES' best games have been sold: Rescue Rangers, Crystalis, and Metroid.
Growing up, I used to play Rescue Rangers for countless hours with my brother (it's an awesome two player game). We'd never really get to the end, because sooner or later I'd always end up BSing my brother by throwing him off edges/platforms and often into enemies. I couldn't help it, because he'd get so mad when I did it.
And imho, Crystalis is hands down one of the best RPGs of all time. Last time I beat it, was around the time Hawke and I shared a class grade 10. He'd play it on the PC during class (when the teacher wasn't looking) and would show me many of the games secrets.
@DMF, not sure if my game save is still on it. If it is, don't load it or you'll spoil the ending for yourself.
If it's not on there, check first to make sure the game is saving. Cause if it isn't, you may have to put in a new battery.