You have to beat Worlds 1, 2, 3, 5, 6, 7, and 8 before you can get to world four.
World 9 does not exist in New Super Mario Bros. DS
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.
No.
To travel to world 6 in the game New super Mario brothers DS, you simply have to win world 5 and will be transferred to world 6.
There is none
You can't. There is no such thing as World 9 on the Ds, But there is on the wii.
if you mean ds,beat world 2's boss as super mini mario.
There is no world 9 in super Mario bros. It only goes up to 8.
Beat world 2
beat world one.
No only on wii.