Levels
The level system of Super Mario Bros is rather simple. The first level you start out on is 1-1, then you progress through 1-2, to 1-3, then the final stage which is always one of Bowser's castles, 1-4. After you beat Bowser, you go to stage 2-1, then so on and so on, but the difficulties do begin to get harder through each stage! By level 5 it begins getting more difficult, and sometimes REALLY tough! The maximum goes up to 8-4... the final castle.
We all know how World 1-1
starts out!! I love it!!
Booda booda booda!! I love
that dungeon music!!
World 1-3 is loads of fun!!
I love jumpin' from the cliffs to others!
World 1-4, the castle, the
Bowser mantle, he can be destroyed by fireballs by the way, and also if you are
not a fireball Mario you must jump or sneak behind or around him to grab the
golden axe behind him,
The battle commences...
OWNED!! You can also beat Bowser by jumping above him and grabbing the Golden
Axe, which will send him into the lava pit, but Fire Ball Mario can roast him,
gaining you 5,000 points!!

We allllll love hearringg that for SEVEN times, "BUT OUR PRINCESS IS IN ANOTHER CASTLE!" then give me the MAIN CASTLE TO GO TO, lol. That's the first set of levels for Super Mario Bros., many more await you...