you have to defeat the boss in world 5 castle with mini mario.
To get to world seven you have to beat the big flying flower on the last castle on world 5 , if you can complete it using mini man (the small blue mushroom) you go straight to world 7 , however if you complete it without mini man you just go to world 6 OR.... You can complete the last castle on world 2 with mini man and this will take you to world 4 , if you manage to complete the last castle on world 4 you can get to world 7 that way , whatever suites you best.
There are two ways to unlock World 7 in New Super Mario Bros.:Get there by using a cannon, orLand the last hit on the World 5 castle boss as Mini Mario/Luigi. If you do this, the sign that says 'W6' will flip around and change to 'W7'.
you have to complete the last castle on world 5 as mini Mario :) have fun !
For world 4 complete world 2 castle defeat the white thing being mini Mario and for world 7 do the same except on world 5 castle!
Well, if you are talking about New Super Mario Bros. for DS, you go the final castle in world 5 where you fight Petey Pirhana. Well, the thing is that you need to defeat him WHILE you are mini Mario or Luigi.
You have to defeat Bowser with Minny Mario on the last level of world 5.
on world 5 you have to beat the boss in the last castle as mini mario.when your supersmall.
to get to world seven you need to beat the boss on the last castle of world 5 using mini mushroom.to get to world 4 you complete the last castle on world 2 with mini mushroom and beat the boss , once you unlock world 4 the cannon will also take you take you to world seven.
its rather hard to do but is doable. first, go to the castle in world 5. you must either be carrying a mini mushroom on reserve or get one from the roulette block that exists towards the end of the castle. then while youre mini you must defeat the petey pirana boss and if you live, Mario will go down a secret path leading to world 7.
To unlock world 4 when you are about fight world 2's boss you must defeat the boss as mini Mario when you beat him world 4 is unlocked. Then to unlock world 7 when you are about to face world 5's boss again you must defeat it by using mini Mario then world 7 should be unlocked.
you have to pound on his head