probably final bowsers castle
In and around Peach's Castle. There are some hard enemies to defeat there. :)
you use bomb-ob twice
Bowser's Third Castle
Well, if you are talking about New Super Mario Bros. for DS, you go the final castle in world 5 where you fight Petey Pirhana. Well, the thing is that you need to defeat him WHILE you are mini Mario or Luigi.
first off: which game? secondly: if in Yoshi's island ds, 5-8 thirdly: in new super Mario bros., the first castle, 7th castle, final castle.
The final "new" course is Rainbow Road, and the final "retro" course is N64 Bowser's Castle.
To get the star Rank, you have to get to level 40 with Mario and Luigi. Your reward is the Excellent! Badge. To get the Final Rank for Bowser, you have to get to level 40 with Bowser. Your reward is the Intruder Fangs. They let you take two turns in a row. Hope I helped!
you get to the world 7 by beating the world 5 final boss witha mini mushroom
There is no game called Super Mario 63. There is one called Super Mario 64. On the final level of it you have to fight and defeat Bowser.
you have to get a cannon from one of the worlds and go in it and boom your there
Try gh.ffshrine.org
you cannot this is the incomplete version. if you go to sheezyart(or somehow)you will find super Mario 63 complete with all 64 shine sprites and 64 star coins and bowser castle is much biger dangerusly nd has got much doors...oh and after the final fight you have to run before the meteor comes to the castle.P.S.when you got 63 shine sprites the cannon outside will be open...blast to the castle roof go on the slingstar and press ''X'' and you will get a wing cap fly at he mountain(near the lake)go right and you will get to a hard level