1. Super Mario Land 2: 6 Golden Coins
This game is a solid Mario platformer. I love the music for this game, especially the space world level music.
It is a very easy game, clocking in at about an hour and a half to beat. The bosses are all similar (take hits on the head) and a bit uninspiring. Besides that, it is very difficult to fault this game, especially considering its platform and the year it was released.