King Boo kidnapped Luigi and sealed him in a giant treasure chest. Then Princess Peach decided to travel though 10 Museums to rescue him after reading a note from King Boo, saying, "I kidnapped Luigi, come and get him, ya daft fruit". Princess Peach had to fight 9 boss battles, Level 1 was Hellen Gravely, Level 2 was Princess Shroob, Level 3 was Petey Piranha, Level 4 was Dimentio, Level 5 was Kamek, Level 6 was Pom Pom, Level 7 was Elder Princess Shroob, Level 8 was Count Bleck, and Level 9 was Cackletta. When Princess Peach had gotten to the final museum, she noticed this one was way darker than the other ones, so she was glad she brought a flashlight with her, but was scared because she didn't know where Luigi was. Suddenly she heard a scream, "PRINCESS PEACH!"
This scared Peach so bad, she ran to see a giant treasure chest standing in front of her. "Don't worry Luigi, I'll find the key." She said before she saw the key standing beside her, she tried to grab it, but it was then swallowed by King Boo. "WELL WELL WELL," King Boo shouted, "If it isn't Princess Peach, or should I say Princess Apricot, I really don't know. Welcome to the museum. If you want the key, you're gonna have to fight me for it, is that too hard for a damsel in distress like yourself to do, Princess Apricot?"
Peach then had no choice, she had to fight King Boo, in order to get the key from him, she had to get past him to light all four giant candles with her Rage power to make the big light, so she went up the 1st stairs, and lit the first candle, King Boo shouted in agony, but he was not yet dead his health was at 30/40, he then slammed Peach up against the wall, which lead Peach's health from 20/20 to now 16/20, Peach wouldn't give up, she dodged King Boo's second approach and went up the 2nd stairs and lit the second candle, King Boo screamed again and his health was now at 20/40, then he breathed blue fire at Peach, he made it, then Peach was burning, she had to throw herself in the water fountain to heal her burn wound, but her was now at 12/20, she flew up the 3rd stairs with her Joy power, but then used Rage again to light the third candle, King Boo screamed another time, his health now at 10/40, he bit Peach right in the neck, her health was now at 5/20. Peach now fully used her Rage power to run up the 4th stairs to light the fourth candle, the bright big light shined upon King Boo and he screamed in terror and the key dropped out of his mouth before his health got to 0/40, he was now deceased and Peach got the key back to save Luigi. The key flew to unlock the treasure chest and Luigi flew out of it. Princess Peach cheerfully and excitedly screamed "LUIGI!" as he did "PRINCESS PEACH!" after she did. They ran over to each other, reuniting. Then they got back to Peach's castle and lived happily ever after.