On world 5 you have to finish the castle at the end on tiny mario... You know the one you get with the tiny blue mushroom? It's the same to get world 4 but you have to do it from world 2...
you have to defeat the boss in world 5 castle with mini mario.
World 7
beat world 6
beet world 5 boss as mini Mario
Beat world five's boss as mini Mario/Luigi.
die
you can by playing hard
you have to be good and watch out from enmies and clifs
you have to beat the boss on world 5 in mini form
SOS S.O.S What is activation code on traivan
For world 4, beat world 2 boss as Mini Mario. For World 7, beat world 5 boss as Mini Mario.
Beat Petey Pirahna on world 5 with a mini mushroom.