There are two ways to unlock World 7 in New Super Mario Bros.:
There is only one way to do that, and that is to beat the world 5 boss when you are tiny. You can defeat him by body slamming, as jumping on him normally will do nothing.
Defeat Petey Piranha (W5 boss) as Mini Mario.
To unlock world seven you must defeat world 5's boss as mini Mario as soon as you do world 7 should be unlocked.
you beat the last castle level on world 5 as the mini blue mushroom guy, that will unlock world seven, beat the castle level in world 6 to unlock world 8
i dont know how the heck you get past it i guess you have to get it yourself because no one ever knows how to do it.
star coins
World 7
beat world 6
10. Paper Mario 9. Super Mario Sunshine 8. New Super Mario Bros. Wii 7. Mario Galaxy 2 6. Super Mario RPG 5. Super Mario World 4. Mario Galaxy 3. Super Mario Bros. 3 2. Super Mario 64 1. Original Super Mario Bros.
10. Paper Mario 9. Super Mario Sunshine 8. New Super Mario Bros. Wii 7. Mario Galaxy 2 6. Super Mario RPG 5. Super Mario World 4. Mario Galaxy 3. Super Mario Bros. 3 2. Super Mario 64 1. Original Super Mario Bros.
10. Paper Mario 9. Super Mario Sunshine 8. New Super Mario Bros. Wii 7. Mario Galaxy 2 6. Super Mario RPG 5. Super Mario World 4. Mario Galaxy 3. Super Mario Bros. 3 2. Super Mario 64 1. Original Super Mario Bros.
beet world 5 boss as mini Mario
Beat world 6 or 7.
10. Paper Mario 9. Super Mario Sunshine 8. New Super Mario Bros. Wii 7. Mario Galaxy 2 6. Super Mario RPG 5. Super Mario World 4. Mario Galaxy 3. Super Mario Bros. 3 2. Super Mario 64 1. Original Super Mario Bros.
die
restart the game
you can by playing hard
Beat world five's boss as mini Mario/Luigi.