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You need to get mini-mushroom on world 1 lvl 4 then do it again so that you have it in your invintory
then go to lvl world 2 and defet world 2 boss then you should have lvl 4 unlocked!!!!!!!!!!!!!!!!!!!
heres is a walkthrough
and here are some cheats> Play as Luigi in single player mode
At the "select a file" screen, keep pressed L and R buttons and choose one of your saved game files with the A button. Now you'll play in the game as Luigi instead of Mario!
Secret Challenge Mode
While paused on the map, press L R L R X X Y Y to enter the secret
Challenge mode. You will now be unable to go back to an area that has
scrolled off the screen while playing a level. This cheat only works
after you finish the game.