Regular Mario Bro. takes place in between Mario Bros.
and Super Mario Brothers. After dealing with a turtle
infestation in Brooklyn, Mario learns of Donkey Kong Jr.'s
whereabouts. He hasn't yet forgotten his humiliating
defeat after trying to capture his father and seeks revenge.
Mario charts a flight and manages to track down DK Jr. to
an offshore island deep within it's jungle. But Junior's
prepared. Knowing Mario was coming, he teamed up with his
ex-boss "Foreman Spike" to set up a series of platforming
challenges across the island. And what's worse, they've
captured Pauline and plan to use her as bait to lure
Mario into their traps.

Will Mario survive all 5 "Rounds" and the inevitable
final confrontation with Donkey Kong Junior?