Super Mario Bros. (Nintendo Entertainment System, 1985)

This is the game that started the almost 40-years franchise that expanded to animated TV-series and movies. It’s fun, it’s challenging and the soundtrack is recognizable everywhere. The original version is still the best version. Later versions on other consoles often crop the image in order to adapt it to different screen geometries, e.g. the NES Classics release on the Game Boy Advanced. Still the king!

Have a look at “How to play retrogames?” if you don’t know how to play retrogames.