The Legend Of Zelda - It was just this huge world full of surprises and many mini-quests to complete. It was my all time favorite!
Megaman 2 - It just was so brightly colored and it played so well. Great gamepad response and a real challenge.
Blaster Master - I never beat this one, it's hard! But the concept and the bosses made it a favorite anyway. Once I got to Level 3 I'd usually used up all 3 of my continues so it was Game Over. I did try the other levels using a Game Genie and unlimited continues along with level skipping but this game is HARD!
It's nice to be important but it's more important to be nice.