Question: how to find all the boos in luigi's mansion 3?
Answer: Basement Near E. Gadd's Lab. ... 
First Floor Lobby in Trash Cans and Lobby Drawers. (Image credit: Nintendo) ... 
2nd Floor Dining Room. (Image credit: Nintendo) ... 
3rd floor in the telephone at the end of the entryway hall. (Image credit: Nintendo) ... 
5th Floor Bedroom. ... 
8th Floor Film Set. ... 
9th Floor in the main exhibit room. ... 
Boiler Room.