There are sixteen collectible Boos, one on every eligible floor from B2 through 14F. The Master Suite on 15F has none. E. Gadd introduces the Boo hunt after the early story progress, and a floor’s Boo becomes available after its boss has been cleared.
Track the vibration, not a fixed container
Gooigi’s tank and controller feedback intensify near a hidden Boo, and the room music changes. Search the strongest signal. A wrong container can make the Boo move to another object or room; the starting areas below are search leads, not guaranteed furniture locations.
Capture a Boo
After it appears and turns invisible, hold Dark-Light on its position until it exposes its tongue. Vacuum the tongue, pull away and slam the Boo repeatedly. Follow its trail through the floor mist if it escapes. Repeat the reveal-and-slam cycle until it is captured.
All sixteen floor searches
| Floor | Boo | Where to begin searching |
|---|---|---|
| B1 — Basement and E. Gadd | Boosement | Laundry Room |
| 1F — Grand Lobby | Gumboo | Grand Lobby |
| 2F — Mezzanine | Booigi | Dressing Room and nearby west-wing rooms |
| 3F — Hotel Shops | Kung Boo | Elevator Hall and shopping corridors |
| 4F — The Great Stage | Boogie | Restroom and concert-floor side rooms |
| 5F — RIP Suites | Booldog | RIP Suites, beginning near Room 508 |
| 6F — Castle MacFrights | Boo-at-Arms | Coliseum Balcony and nearby armour |
| 7F — Garden Suites | Bootanist | Thorny Bathroom and garden rooms |
| 8F — Paranormal Productions | Booducer | Horror Set and film studios |
| 9F — Unnatural History Museum | Boones | Exhibit Hall |
| B2 — Boilerworks | ComBooster | Main Tank and Boilerworks rooms |
| 10F — Tomb Suites | Anuboo | Snake Chamber and pyramid rooms |
| 11F — Twisted Suites | Boofuddler | Trainer’s Bedroom and magician rooms |
| 12F — The Spectral Catch | Boocaneer | Beach and pirate-floor rooms |
| 13F — Fitness Center | Boodybuilder | Pool and fitness rooms |
| 14F — The Dance Hall | Boosician | Elevator Hall and dance-floor rooms |
Reward and final check
Capturing every Boo unlocks Flashlight Type-B in E. Gadd’s gallery. Check the sixteen captured entries rather than searching 15F for a nonexistent final Boo. The alternate flashlight is cosmetic and does not change the Strobulb’s combat effect.