Super Marios Bros was one of the first stand out title for the Nintendo Entertainment system. Super Mario Bros 3 is perhaps the most complex and visually superior of the three. It contained advance graphics for an NES game. It also has some elemnts in it such as bonus stages, bonus items and new powerups to further enhance game play.
The quest is simple. Its to save princess Toadstool from the clutches of the Koopa clan. Here you would face the Koopa Kids - Ludwig, Lemmy, Roy, Iggy, Wendy, Morton and Larry and then Bowser himself. The Koopa Kids are fairly easy to beat and so is Bowser. You just have to know their patterns and time your movements properly.
I truly appreciate the fact that each level has a different theme which makes the game more fun. I also appreciate the games generosity in terms of your chances to get powerups and extra lives. I would recommend this to any gamer out there. This is perhaps the greatest NES game of all time!