You can't unless you get action replay.
you cannot do it
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.
No.
you can not play as Yoshi in new super Mario bros DS
She's on the roof
Mario stars in an array of titles for the Nintendo DS. There are games where he fights Donkey Kong as well as the classic "Yoshi's Story." There are also games such as Super Mario Brothers.
Peach is with Bowser locked away in her own castle and Mario must save her with his friends.
you cant.only in super Mario 64&super Mario 64 ds.
On top of the hill. After Princess Peach sends Mario the same note as the original Super Mario 64. :)
No, the only playable characters on the DS version is Mario and Luigi. In the Wii version the only playable characters are Toad, Mario, Luigi and Yoshi.
The new super Mario brothers
no