How to save games?

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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there is no world 9 in new super mario bros.
there is however a world 9 in New super Mario bros. Wii

Beat Boss 2 & 5 as mini mario.

I am sorry to say, there is no way to retrieve it. :(

here is a helpful walkthrough. http://au.ds.gamespy.com/nintendo-ds/new-super-mario-bros/guide/index.html

To get st seven world, you must won the previus castle with mini mario.

When you have completed half a world a message will then appear on the screen.
saying Save? and give options like "yes" or "no"

If you run out of lives completely before beating either a mini boss or the actual bos you will hqave to start that part of world again.

Hope that helps

you haf to get to beat the bosses in world 2 & 5 with mini mario. or beat the boss in world 2 as mini mario, and do it 2 world 4 as well 2 save time.

WHAT SECRET LEVELS DO YOU MEAN WORLD 4 AND 7
I KNOW THE SOLUTION JUST GO ON WORLD 2 THEN GET A TINY MUSHROOM THEN FIGHT THE BOSS IN THE SECOND CASTLE IN YOUR TINY FORM THE SAME AS WORLD 7

God this game was easy whats the problem then the big castle at the end??