I was born in the July of 99, but, believe or not I still had the luck to play the original Super Mario Brothers (NES) through a PS1 Slim that had a hacked chip, I remember playing a ROM hack version of Mario that went too fast and the original one (although I don't remember which one was first).
After that Metal Slug X and its sequels and prequels on my hacked PS1 were the best thing ever, I still love Metal Slug to this day.