Or should I say, to the person who can tell me how the Ninentdo game Milan's Secret Castle ended after the last castle board. The thread about old rpgs got me thinking about games I played on Nintendo that might be considered RPG, and I remembered that damn game I traded Zelda for it, and it was so hard. Every time you die, you have to start the whole thing over. I did so, and many time. Many, many hours, days weeks, months. I just couldn't beat it. Tell me how it ended if you played it, and if you tell me like you played it (LitRPG) maybe a tip. No googling. I'll be able to tell if you've played it.
I had to look it up and its just so familiar,,,, then I realized! this is super mario the rip-off!!! my answer is = your princess is in another castle!
Is that clip from the game you looked up? That's not Milan's Secret Castle. I might be remembering the story wrong, but I think you are going after an evil monster overlord.