10) Duck Hunt - By far, it was the best shooting for the NES> It was the reason to have the Nintendo Zapper.
9) Ice Climber - It's a cult classic. I know it's not the most advanced gameplay ever concocted but it's still a blast to play, even to this day.
8) Metroid - Completely innovative. Started a monster franchise. It may not be the best of the series, but where would it be without it?
7) Zelda II: The Adventure of Link - I know this isn't a popular one for the Zelda fans. It's hard game to get into. But once you do you're absolutely hooked.
6) Castlevania - There may have been better games in the series, but where would it be without the original. Games like Resident Evil owe a great debt to this game.
5) Tecmo Bowl - Not only the greatest sports game for the NES, you could make an argument that it's the greatest sports game in video game history. I'll take this over Madden any day.
4) Contra - The incredible 30 player code that everybody memorized. It was impossible to beat it without it. It was also an incredible co-op game.
3) Super Mario Bros - Where would the video game world be without this powerhouse? I remember how amazing it was when the character moved, the screen followed. You can't event think of the NES without this game.
2) The Legend of Zelda - I've actually lost count on how many games were influenced by the original Legend of Zelda. Even with its long and illustrious series, the original still might be the best one, and that's really saying something.
1) Super Mario Bros. 3 - Incredible and innovative gameplay. You could tell where the future of gaming was headed after playing this game.