In world two's final castle you have to beat the boss as Mini Mario. You have to ground pound on him three times and he will be dead. You get to world six by just just beating world five's boss.
You can't.
You can't. It is impossible
will there be a new super Mario brothers movie
You can't create levels.
You have to get red flags on the level next to it.
Beat the boss as a mini person
no in new super Mario bros there is no level 0 there is only worlds like world 1,2,3,4,5,6,7,8
You have to finish a level with the secret goal on the level closest to the cannon.
Beat bowser, and huge bowser on the last level.
get a red flag on the levl before it.
Yes.With NSMB4 Level Editor
No, there is no whistle in New Super Mario Bros.