Everyone thought Bowser had left the Mushroom Kingdom until his doom ship attacked. King Koopa had returned with the greatest danger ever known: his Koopa Kids! Using their new super powers, help the Super Mario Brothers rescue Princess Toadstool and beat the evil Koopa family.
The game centers on the quest of Mario and Luigi to save the rulers of seven kingdoms from Bowser, the series' antagonist. The two brothers must travel across eight worlds to restore order to the Mushroom World. It built on the game play of previous Mario games by introducing new power-ups that augment character abilities, and established conventions that were carried over to future games in the series.
- Prior to its North American release, game play footage from Super Mario Bros. 3 appeared in the Universal Studios film The Wizard, which helped fuel its fans' anticipation.