New Super Mario Bros. (help)

[NintendoNerds]

OK...finally beat this game. I absolutely loved it!! I thoroughly enjoyed going through.

I have a slight problem however...

Even after beating the game I never played World 4 or World 7. Did I miss something somewhere?

[Chris]

You see where the path forks on the map? Go into the level prior to the fork, and defeat the boss as Mini Mario.