By far the absolute best of the Mario Bros games. Starts off easy and gets harder gradually. The ending if I remember right was friggin hard but when you beat Bowser you'll never forget it.
But this game. I'm a 80's kid and have loved this probably 30years. Used to rent it every chance I could. We didn't have the internet, we didn't need it. We had classics like this, our bicycle and a blockbuster about three blocks away on a Friday night after school.