I haven't been gaming as long as some of you other people apparently have, but I've still got a few to name.

Golden Sun
Golden Sun:The Lost Age
Spyro: Year of the Dragon
Mario Kart: Double Dash!
Pokemon Red
Pokemon Yellow
Pokemon Silver
Pokemon Crystal
Pokemon Ruby
Pokemon Emerald
Pokemon Diamond
Pokemon XD: Gale of Darkness
Dragon Ball Z: Buu's Fury
Final Fantasy X
Portal
Kingdom Hearts
The Legend of Zelda: Oracle of Ages
The Legend of Zelda: Phantom Hourglass
Halo
Warcraft III: Reign of Chaos
Warcraft III: The Frozen Throne
Baldur's Gate
Baldur's Gate II: Shadows of Amn
RuneScape Free Version (I've done every quest. I'm counting it.)
Zork (the original)
Guitar Hero
Guitar Hero II
Grand Theft Auto: San Andreas
Bonk's Revenge (very old TurboGrafX game)
The Legendary Axe (another TurboGrafX one)

That's all I can think of now...