I am currently playing the gbc version of this game, it's a pretty nice port and helps you keep track of all the levels you've completed. The first mario game is a classic and a must have. Every gamer in the world should give it a go at least once, it's weird it hasn't gotten a remake yet, being one of the most important Nintendo titles.
I remember the godo times of playing this game with my sisters! It was just so much fun! I will always remember having to tune in to channel 3 or 4 and cheating pressing the gun against the TV screen when they werent looking! And the fear and rage little me always felt in world 4 when playing super mario bros