First Game you 100 percented?

[Amissapanda]

It's really difficult to think that far back, but I'm pretty sure the first one I ever fully-completed was either Phantom Fighter or Dragon Warrior IV (probably the former, as far as 100% goes). And close in the running is Super Mario Bros. 3.

 

[Ponyu]

I don't know for sure: either The Beauty and the Beast, both for SNES, or DuckTales for the original Game Boy. Though neither of these gave actual percentages, so the first game which actually gave me a "yay, 100%!" message was probably Wario Land II for the Game Boy Color. I loved that game!

 

[AcousticHearts]

I'm pretty sure it was Sonic the Hedgehog 3 for me. I played it so much all of the time. I couldn't save whenever I played it, so I was eventually able to get every single thing done and still love that game to this day. Plus I am a big fan of classic Sonic. xD