Sadly Mario, Luigi or Bowser wont level up after you beat the final boss (Dark Bowser). After you beat Dark Bowser the game will reset to the spot from where you turned it on. An easy way to level up Mario and Luigi is to fight enemies over and over in the airway. I dont know for sure how to level up Bowser but is has something to do with using The Broggy Bonker attack. I would save before you fight Dark Bowser so your levels wont reset. Good luck with Dark Bowser.
bowser has 92%
You go through the pipes in bowsers body
noone
There's Save Blocks everywhere! Inside Bowser and outside Bowser.
You can go into Bowser's Castle when trying to get out of the path.
There are only 2 files in Mario and Luigi Bowser's Inside Story.
bowser can breath fire!
Where are you, are you in the castle, have you found bowser?
You have to defeat a bug that's blocking Bowser's flame pipe.
u hav to go into bowsers memory banks and u beat fake Mario and luigi then get the code
You unlock nothing.
The Memory Banks should be in Bowsers head. When you can choose where you want to go inside Bowser, go to the Memory Banks in Bowser's head. (But you have to unlock the Memory Banks so you might not have it)