What do we have to do to unlock the world 7? - Nintendo New Super Mario Bros. for DS

Hi,
To get World 7 unlocked in the Nintendo DS New Super Mario Bros, you have to actually defeat the boss at the end of World 5 as mini mario. Sorry!
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To unlock world 4 you must
Beat the boss in the last castle of World 2 as Mini Mario.
and to unlock world 7 you must
Defeat the World 5 Castle Boss as Mini Mario or unlock the World 4 Cannon (you need to finish the W4 haunted house with a RED FLAG)

Unlockable: World 7 To unlock world 7, do one of the following:

• 1. Defeat the World 5 Castle Boss as Mini Mario or...
• 2. Unlock the World 4 Cannon (you need to finish the W4 Haunted House with a RED FLAG)

• 1. Defeat the World 5 Castle Boss as Mini Mario or...
• 2. Unlock the World 4 Cannon (you need to finish the W4 Haunted House with a RED FLAG)

you have done the alternate way to end world 6 and unlock world 8.so finish world 6 again but without warp pipes on the map and a,b,c.i wish that works!

Sorry, but data that has been erased is gone forever.

You need to get the mini mushroom's in each castle and beat the boss of each castle while staying mini for both world 4 and 7 to be unlocked.

just beat the last boss in world 2 (sand worm i think) using the mushroom that makes you tiny. Do the same thing in world 5 to unlock world 7.

cause u have to beat the boss as mini mario or luigi.

for world 4and7 you have to be mini on world 2 then defet the boss on that like mini and there is world 4 on the map (do the same on world 5 for 7)