You have to defeat every big bowser castle on the other worlds while using a tiny guy, that's how you unlock world 4, then when world 4 is complete, you unlock 7
you have to beat world 3 and 6 as mini Mario.
by beating the last boss
When selecting your saved game with A, hold L and R buttons. You will play as Luigi.
in Mario Bros. Wii it is the Beach world. In Super Mario Bros. DS, it is Jungle world
You can't. There is no such thing as World 9 on the Ds, But there is on the wii.
Professor Egad isn't in the game.
No
Because it was part of the plot? Why did you ask? It happens in Mario Galaxy though not Mario DS
You can't without cheating.
World 9 does not exist in New Super Mario Bros. DS
win the first world
beat world one.
There is none