I'd say a lot of hard enemies are in Peach's Courtyard and inside Peach's Castle. The ones in Peach's Castle are harder though. The hardest enemy would be Dark Mechawful. (He's a blue robot looking guy and he's in Peach's Castle) Hope I helped!
bowser has 92%
you can't
you dont nimrod
You go through the pipes in bowsers body
after awhile you can get out through the pipe spot.but first you have to help the moles with bowser
There's Save Blocks everywhere! Inside Bowser and outside Bowser.
You get hit by a laser. then you fall down and the pipe yard inside bowser opens up and you get out through a pipe
You can go into Bowser's Castle when trying to get out of the path.
Dark Bowser, the final boss, has 1,000 Health Points.
Sorry, you can't. But you can swim with Bowser by pressing Y.
bowser can breath fire!
Bowser would have to punch it from the correct side. That should bring it down. :)