I need help with New Super Mario Bros. 2 on the 3DS.

It wasn't easy, but I got all the star coins in the game. Of the levels I can reach I mean, I haven't found all the secret levels.

I thought that I would get something by getting all the starcoins, but nope, nothing at all happened. Am I doing something wrong?

Also, if this is not the best way to ask for help, I apologize, I am looking for the proper message board to get help in a Mario game, and I hope I'm doing it right.

You're fine, but next time go to the board labelled HelpDesk.

Anyway the wiki says there are 219 Star Coins in NSMB2. How many did you get?

You probably need the secret level star coins.

Four of the star coins were totally impossible to figure out on my own.

And apparently it's even more difficult to figure out where all the secret flagpoles are. I only found two of them on my own. The one that unlocks 4-C and the one that unlocks 6-A.

I went to every inch of the other levels and couldn't find the secret flagpoles there. I guess I have to use a walkthrough, thanks for the help.