- each location Luigi visits is broken down into a series of missions
- missions are provided by Professor E. Gadd
- receive a checklist of objectives, with waypoints coming courtesy of a DS-esque device that features a full map
- getting a new attachment for the Poltergust 5000 involves solving multiple puzzles, tracking through various rooms and fighting off ghosts
- cash and gems contribute to mission-by-mission scores (based on your clearance time, ghosts defeated, cash acquired and more)
- they also factor into vacuum upgrades as well
- fighting ghosts involves a flash-then-capture system
- use a strobe light to stun a ghost
- ghosts can vanish quickly
- some ghosts have ranged attacks
- other ghosts wear sunglasses which block your flash
- you'll have to remove the sunglasses to capture them
- use the Dark/Light device to uncover hidden objects and enemies
- eventually fight off bosses
- one location is the Old Clockwork Mansion