There are thirty-two Boos in Luigi’s Mansion 2 HD. Most standard missions contain one. E-4 is the exception: its Big Boo fight supplies ten. Boss and bonus missions do not each hide an extra Boo. The mission-selector Boo marker shows which captures have been recorded.
Obtain Dark-Light during A-4 before returning to A-1, A-2 and A-3. Shine it over a missing object, then vacuum the Spirit Balls to restore that object. Reveal a loose Boo with Dark-Light, grab its tongue and release it to bounce around the room. Vacuum it from the floor once its health is depleted. Complete the mission to keep the recorded capture.
Gloomy Manor — 5 Boos
- A-1: Poltergust 5000 — Garage. Return after A-4 and restore the missing wheel near the entrance.
- A-2: Gear Up — Mudroom. Return after A-4 and restore the missing table by the foreground wall.
- A-3: Quiet Please! — Studio. Return after A-4, pull the cloth and restore the missing easel beside the camera.
- A-4: Visual Tricks — Dining Room. Restore the missing table. This Boo encounter is required to finish A-4.
- A-5: Sticky Situation — Lower Library. Restore the missing piano. In the English HD release, this Boo is named Boothoven.
After finishing the mansion’s boss and capturing its full Boo set, play Gradual Infiltration.
Haunted Towers — 5 Boos
- B-1: A Job for a Plumber — Hydro Generator. Restore the drawer cabinet in the back-right corner and inspect it.
- B-2: The Pinwheel Gate — Sewer. Enter north of the Gardener’s Lab and pull the first hanging red plant.
- B-3: Graveyard Shift — Crypt. After freeing Toad, restore the vase to the right of his painting and inspect it.
- B-4: Pool Party — Family Room. Restore the missing painting on the left side of the rear wall and inspect it.
- B-5: Doggone Key — Tool Shed. After following Polterpup into the Garden, return and restore all the missing tools, containers, furniture and ladder. Keep sweeping until every Spirit Ball is caught and the Boo appears.
After finishing the mansion’s boss and capturing its full Boo set, play Hostile Intrusion.
Old Clockworks — 5 Boos
- C-1: A Timely Entrance — Warehouse. Put the red ribbon spool from the right side in the machine and unravel it. The hidden green spool contains a ruby instead.
- C-2: Underground Expedition — Quarry. Raise the sand, then restore the upper bridge with Dark-Light. The Boo seen earlier in the sarcophagus cannot be caught there.
- C-3: Roundhouse Brawl — Kiln Room. Close both steam valves, restoring the missing right one first. Vacuum the steam, flash the switch and catch the two Greenies in the compartment.
- C-4: Play Catch — Clock Tower Gate. After finding Polterpup in the Workshop, enter this room and restore the missing lamp on the right side of the ceiling.
- C-5: Piece at Last — Crank Room. Restore the central gear and ride the large moving gear to the upper platform. Pull the loose sheet on the left and reveal the hidden box in the side room.
After finishing the mansion’s boss and capturing its full Boo set, play Outlandish Interruption.
Secret Mine — 3 Boos
- D-1: Cold Case — Terminal. After obtaining the Airway key, return to the Terminal. Pull the false covering from the mirror and restore the missing barrel beside the reflected door.
- D-2: Hit Rock Bottom — Chalet. Restore the rocking chair beside the fireplace.
- D-3: Across the Chasm — Deep Hall. Restore the kettle above the fire, then blow it into position and wait for ParaBoola to emerge.
After finishing the mansion’s boss and capturing its full Boo set, play Severe Infestation.
Treacherous Mansion — 14 Boos
- E-1: Front-Door Key — Underground Lab. After clearing the ghosts, turn the rear wheel until its gauge reaches the end.
- E-2: Double Trouble — Courtyard. Put one rescued Toad in each statue cage, clear the interruption and reveal the Boo with Dark-Light. This is part of the story route.
- E-3: A Train to Catch — Dark Age Exhibit. Bring a purple Bulb from the Study and float to the high Gold Bulb. Complete the timed coin challenge and open the chest.
- E-4: Ambush Maneuver — Train model — ten Boos. Split Big Boo against the drill and shoot all ten smaller Boos into the train cages. Completing the battle supplies ten entries, not one.
- E-5: Paranormal Chaos — Aviation Exhibit. Before triggering the Terrace outbreak, reveal the missing hot-air balloon with Dark-Light.
After finishing the mansion’s boss and capturing its full Boo set, play Terrifying Invasion.