8 worlds x 4 levels each = 32 levels total
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super Mario bros. has 32 levels.
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There are 4, Super Mario Bros. 1, Super Mario Bros. 2 and Super Mario Bros. 3, there is also Super Mario Bros. The Lost Levels which is the original Super Mario Bros. 2 in Japan. They have also made a remake of Super Mario All-Stars for Nintendo Wii.
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.
There are not secret levels in this game.