From the Super Mario Wiki
Mario comes here to wake up Big Massif so that he can start the Mount Pajamaja tour. A mysterious referee says that Big Massif will appear if he defeats four of Big Massif's minions. After Mario defeats them, the referee reveals himself to be Big Massif, who refuses to wake up unless Mario beats him in battle, which he does. The two return to the real world. Mario comes here a second time in order to free Bedsmith, who can assemble the Ultibed for him. After a long journey, Mario accidentally activates a security system which summons Earthwake. Giant Luigi defeats the monster and Mario frees Bedsmith. The special attack Luiginary Wall is learned here in the second visit.
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