I finished Metroid II: Return of Samus (1992). That game is 3 years older than me, it's archaic and has been lying around for as long as I can remember. I love the sidescroller Metroid compared to FPS Metroid (I've played 2 metroid games, the sidescroller can keep my interest, the other can't, maybe I'll play Corruption again one day and finish it....). I have played through it 3 times, this time being the third, the second time was years ago (five, maybe?) and now my reflexes are good enough to endure the final boss.
Mother Metroid ain't got nothin' on me. When I get a 3DS, which will be a good while from now, I'll give the original Metroid a go. I know I'll love it.