No, World 8 is the last level, although you can unlock a different mode which allows you to replay all the worlds at a more difficult level.
You can't.
You can't. It is impossible
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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
On the last level of world 2 use tiny Mario to fight the monster and you can get to world 4 with tiny Mario