NES

Super Mario Bros./Duck Hunt
Super Mario Bros. 2
Super Mario Bros. 3
Official Licensee Major League Baseball
Baseball Simulator 1,000
Felix the Cat
Kirby's Adventure
Bad Dudes
Top Gun: The Second Mission
Star Wars
Darkwing Duck
Mega Man 2
Mega Man 3
Mega Man 4
Mega Man 6
Final Fantasy
The Legend of Zelda
Zelda II: The Adventure of Link

SNES (I used to have more SNES games, but sold 'em to get a N64 some 7 years ago)

Chrono Trigger
The Legend of Zelda: A Link to the Past
Breath of Fire
Breath of Fire II
Mario Paint
Super Mario All-Stars
Super Gameboy

N64

Super Mario 64
007: Goldeneye
Pokémon Snap
Pokémon Stadium
Star Wars: Rouge Squadron
Super Smash Brothes
Jet Force Gemeni
Mario Party
Star Wars Episode I: Pod Racer
The Legend of Zelda: The Ocarina of Time
The Legend of Zelda: Majora's Mask

Game Cube

Super Mario Sunshine
The Legend of Zelda: The Wind Waker
Super Smash Brothers Melee
Super Mario Kart: Double Dash!
Animal Crossing
The Legend of Zelda: Ocarina of Time Bonus Disc
The Legend of Zelda Collector's Disc
Enter the Matrix
Star Wars: Rouge Leader

Playstation

Final Fantasy Origins
Final Fantasy Chronicales
Final Fantasy Anthology
Final Fantasy VII
Final Fantasy VIII
Final Fantasy IX
Final Fantasy Tactics
Chrono Cross
Tales of Phantasia (Japanese)
Lunar 2: Eternal Blue Complete
Xenogears
Breath of Fire III
Star Ocean: The Second Story
Valkyrie Profile
Hoshigami: Ruining Blue Earth

Playstation 2

Final Fantasy X
Final Fantasy X-2
Disgaea: Hour of Darkness
Kingdom Hearts
.hack//Infection
.hack//Mutation
Xenosaga

Game Boy/Color/Advance

- GB

Super Mario Land
Super Mario Land 2: 6 Golden Coins
Final Fantasy Legend III
Great Greed
Spider-Man 2
Donkey Kong
Kirby's Dream Land 2
Dr. Mario
Mega Man II
Tetris
Star Wars: Super Return of the Jedi
Spanky's Quest
Pokémon Blue
Pokémon Red
Pokémon Yellow

-GBC

Pokémon Gold
Pokémon Silver
Pokémon Pinball
Pokémon Trading Card Game
The Legend of Zelda: Link's Awakening DX
The Legend of Zelda: Oracle of Seasons
Dragon Warrior Monsters

-GBA/SP

Golden Sun
Golden Sun: The Lost Age
Final Fantasy Tactics Advance
Mario & Luigi: Superstar Saga
Tactics Ogre: The Knight of Lodis
Pokémon Sapphire

PC

Final Fantasy XI
Final Fantasy VII
Star Craft
Quake III Arena
Jedi Knight: Dark Forces II
Street Fighter Alpha
Diablo II
Warcraft II
Mario is Missing
Mega Man X
And some more, mostly Star Wars.