Use Wikipedia and come up with your top 10 games of x year. We're starting with 1990.

http://en.wikipedia.org/wiki/Category:1990_video_games

Here's my list (no order):

1. Mega Man 3
2. Actraiser
3. Ducktales
4. Dr. Mario
5. Ninja Gaiden II: Dark Sword of Chaos
6. StarTropics
7. Super Mario World
8. Where in the World is Carmen Sandiego
9. Nintendo World Cup
10. Gaiares

ActRaiser
Double Dragon 3

That's only 2 games.

THOSE ARE MY FAVORITE!!!!!!!

What is that Super Mario Bros pack-in doing in the list? I'm pretty sure that came before 1990. Whatever, if it's on the list, might as well include it. So, in no intentional order...

3-in-1 Super Mario Bros./Duck Hunt/World Class Track Meet
Dr. Mario
Dragon Quest IV: Chapters of the Chosen
Final Fantasy Legend II
Railroad Tycoon
Pin*Bot
Snake Rattle 'N' Roll
Super Buster Bros.
Super Mario World

And those are the only 1990 games that I played. Which actually is more than I expected, probably 'cause these dates aren't based on the US dates. I'd like to note I also played Crystalis, but it was the GBC release, which will probably be in a future list.

And this list is clearly including Japanese releases. Dragon Quest IV, for one, was renamed and released outside Japan in 1992. F-Zero is in this list, and released outside Japan in 1991. Final Fantasy Legend II is probably only mentioned as that title 'cause the Wiki article does. Actually, scratch that. This list is based on the Wiki articles. Makes me wonder about those games which don't have Wiki articles.

Hmm.. let's see what can I find there...
Ah, this kind of depressing, the list turned itself into "The only 7 games I played of 1990"...

Ducktales
Super Mario World
Where in the World is Carmen Sandiego?
Little Nemo: The Dream Master
Muppet Adventure: Chaos at the Carnival
Adventures of Lolo 2
Chip and Dale Rescue Rangers

And it seems the 3 in one bundle NES cartridge thingy is not indeed of 1990, but from 1988. (It only appears on the list when you see the top one. If you choose the "0-9" option, it doesn't appear there)