Donkey Kong Country, my first game.

That was my second game!

Mega Man 2 mostly, followed by Metroid and Final Fantasy.

The Legend of Zelda: Majora's Mask

I would say that teenage mutant ninja turtles the arcade game changed my life. I remember all the time when I was young and I would constantly play that game at my chuck E. cheese until I ran out of tokens. Good times esspecially with friends. :)

Final Fantasy VIII

Mario Kart: Double Dash!!: First Videogame ever

Chrono Trigger: Massively raised my love for gaming

Paper Mario 64, in my book probably the greatest game ever

Pokemon Red/Blue easily:

It got me into gaming.  It also made me into a Nintendo fan and go against the mass Sony zeitgeist of the time.  It also got me into JRPGs which are easily my favourite genre and make up a lot of my gaming collection.

That game defined who I am as a gamer

Spear of Destiny was one of the first games I've played. And it's still one of my favorites. Yes, you haven't heard of it but you get the idea when I say it's the sequel to Wolfenstein 3D (or actually prequel).

Other big games include Metal Gear Solid and Final Fantasy X but they're nowhere near as important as SoD. Oh, and I compare every single multiplayer game I play to Wolfenstein: Enemy Territory, it's just that good. Naturally there are other games than what I've mentioned here but these are the most important.