Hm....I can't really remember. I beat Chip & Dale: Rescue Rangers, Duck Tales, and Flintstones on the NES when I was a kid...but I can't really remember which was first. I'm pretty sure I beat Super Mario Bros 3 when I was slightly older...though possibly one of the Gameboy Mario Land games I might have beaten before then.

I am fairly certain it is Mario Bros 3. I don't remember doing it, but it was the first one I had. Somehow I learned all the secrets to it too...

My first beaten game was Double Dragon 2, it came in a multi-game cartridge for my console and I beat it with a neighbor that came to test my new Family (in South America was very hard to get a NES)

That's a really tough one. O_o

But I think it was Dam Buster on the ColecoVision.

Super Mario World!!!

Pokemon Yellow. Me and my incredible team of a Lv 89 Pikachu, Lv 100 Zapdos, Lv 33 Snorlax, Lv 48 Omastar, Lv 51 Butterfree and Lv 65 Nidoking finally got through the E4 after ~80 hours. If I recall correctly, it took me two hours to get out of the starting house in the first place. Still have the file, just holding on it's original cartridge.

I can't wait for it to come on the VC next month, I plan on running through with that same team of six and then not touching Pokemon again for a while (unless Gen VII looks irresistible.)

Probably either the simpsons or teenage mutant ninja turtles arcade game.

Pokemon Red version I was 10 years old and obsessed with the game.

I was 4 when I somehow beat Pokemon Ruby.

I had the legendaries, level 100 pokemon, almost all of the Pokedex completed...

I truly don't know how I understood the game when I was four.

Zelda Link's Awakening. I have this game to thank for getting me interested in gaming. My bro and I used to sit on the carpet with a gameboy and play it under a lamp. Good times.