If you mean the Super Mario Bros. from 1985, you answer is thirty-two levels. You see, there are eight worlds, each containg four levels, one being a Bowser Castle.
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I think it was called............ Super Mario brothers or just Mario brothers.
20
On the original Super Mario Brothers, I believe they just add up.
Nope.
In the original you can play as Mario and Luigi. In New Super Mario Bros DS you can play as MArio AND LUIGI. IN NEW SUPER MARIO BROS WII ITS MARIO, LUIGI, BLUE TOAD, AND YELLOW TOAD.