Mario travels to Boggly Woods in search of the second Crystal Star. He runs into the Shadow Sirens, who barely recognise him until they see the Wanted poster given to them by Sir Grodus. Mario must retrieve Flurrie's Necklace from them by defeating them, and then return it to Flurrie in order to unlock Flurrie as a partner. After that, Mario and Co. must rid the Great Tree of the X-Nauts and Lord Crump in order to get the second Crystal Star.