Use this checklist before following Mario to the roof. It separates the complete hotel collection from the extra multiplayer achievements so the remaining objective is clear.
Story and boss ghosts
Rescue E. Gadd, unlock Gooigi and Super Suction, defeat every floor boss and both Polterkitty chases, then defeat Hellen Gravely and King Boo. Capture Morty separately after his film is finished if collecting every optional hotel ghost.
Gems — 102
Check six colours on all seventeen floors. Revisit B1, 1F and 5F with Gooigi, 4F with Super Suction and B2’s Old Reservoir during the later Toad mission.
Boos — sixteen
Catch one on each eligible floor through 14F. There is no Boo on 15F. A wrong hiding object can move a Boo, so follow vibration feedback.
Ending rank — A
Keep at least 70,000G until the ending. The rank does not substitute for the gem, Boo or achievement collections.
All achievements — fifty-three
Complete twenty-three Collection achievements, seventeen Hotel tasks, seven Battle challenges and six ScareScraper objectives. Teammate revivals require multiplayer participation.
Rewards and final save
Check Suction Shot Type-C for gems, Flashlight Type-B for Boos and Poltergust Type-G for all achievements. The hotel is revisited from a pre-finale checkpoint rather than a new free-roaming post-game save.