I was confused when I saw the buttons B A R B Select A X Y. Is it ok to do other than this to get to Bowser?

What do you mean?

In Fraternal Fortress, you see the buttons on the screen (B A R B Select A X Y). It helps you to get the blue switch.

Yes what is with that?

There is another one to make the good ending. It is B A R B Down A B Select.

Thanks for the spoiler, bro