I got Karnov and Friday the 13th one day as a kid. It was from a cousin who didn't like either game anymore. I received both a few days after receiving Adventure Island II for Christmas. The three games were a pretty big part of my childhood, when I only owned 20 games or so. Karnov will always be remembered for its insane robotic fish people, t-rexes, and wacky settings. This is defiantly one of the defining games of the NES, and every collector/gamer needs a copy.
I gave Karnov a try tonight, while I was taking a break from WoW. I can still get to the Caterpillar woman boss on Stage 4, but I can't beat her! Never could as a kid either. This is one of those games than has haunted me since I was a kid.