you don't. only the wii version has it. The only secret worlds are 4 and 7 whick you have to use a mini shromm to defeat the boss in worlds 2 and 5. you can also unlock stars bside your file by completing the game once, beating all the levels, and getting and spending all your star coins.
beat and unlock all the other levels. my mom is the Mario master
you beat the world 2 final boss as mini Mario and you will unlock world 4. Do the same thing in world 5 to get world 7
you must get all the star coins in each world to unlock the levels on world 9.
you play super Mario and all you do is play that is how you make the world of super Mario because you just complete levels
96
you first have to unlock sonic
Complete World Star-2
There's no World 9 on New Super Mario Bros. for DS. In New Super Mario Bros. Wii, World 9 is unlocked after you rescue Princess Peach.
There's no such thing!
it is not stars it is a world
collect all the star coins from each world to unlock the ninth one
How do you get to world 4 on super mario bros ds?