King Boo's Illusion is the final level/area in Luigi's Mansion: Dark Moon.
After defeating the Tough Possessor in the Treacherous Mansion, Luigi gets pixelated, but back at the lab, when Professor E. Gadd expects Luigi to come out of the pixelator, only the Dark Moon shard comes out. You then see Luigi's pixels surrounded in a purple aura. Then his pixels bump into each other to make Luigi, then Luigi falls to the ground of a dark room. Then he hears King Boo and certains open to reveal many windows and a picture of Mario can be seen. Then the battle starts.
|Luigi · Professor E. Gadd · King Boo · Mario|
|Ancient Poltergeist · Boo · Creeper · Gobber · Greenie · Gold Greenie · Hider · Poltergeist · Polterpup · Slammer · Sneaker · Strong Gobber · Strong Greenie · Strong Hider · Strong Slammer · Strong Sneaker · The Three Sisters|
|Grouchy Possessor · Harsh Possessor · Overset Possessor · Shrewd Possessor · Tough Possessor · King Boo|
|E. Gadd's Bunker · Evershade Valley · Gloomy Manor · Haunted Towers · Old Clockworks · Secret Mine · Treacherous Mansion|
|Dark Moon · Dark-Light Device · Dual Scream · Golden Bone · Key · Poltergust 5000 · Strobulb|