A walkthrough for Gradual Infiltration in Luigi's Mansion 2 HD (Dark Moon) for the Nintendo Switch. Read on for a detailed guide for Gradual Infiltration, including how to get 3 stars, and how to unlock the Gradual Infiltration bonus mission!

How to Unlock Gradual Infiltration

The Bonus Mission, Gradual Infiltration, is unlocked by capturing all the Boos in the Gloomy Manor. Additionally you would have to complete the Boss stage for the respective mansion to unlock the bonus mission.

✔️	Mission	Boo Name	HP	How to Find
	A-1 Poltergust 5000	Boogie Woogie	20	Room: Garage Enter the garage, suck up all the dust, and use the Dark-Light Device in the northeast corner near the drawers, where the wooden stool originally was. Suck up all the spirit balls to reveal the Boo.
	A-2 Gear Up	BaBoon	20	Room: Mudroom Enter the mudroom and use the Dark-Light Device in the south wall where a small table originally was. Suck up all the spirit balls to reveal the Boo.
	A-3 Quiet Please!	Boo Boo	20	Room: Studio Enter the studio, remove the sheet that is covering the painting canvas, and use the Dark-Light Device where the painting canvas originally was. Suck up all the spirit balls to reveal the Boo.
	A-4 Visual Tricks	Unnamed Boo	15	Room: Dining Room Enter the dining room and use the Dark-Light Device in the middle of the room where the dining table originally was. Suck up all the spirit balls to reveal the Boo.
	A-5 Sticky Situation	Boothoven	20	Room: Library Enter the library and use the Dark-Light Device in the northeast corner where the piano originally was. Suck up the spirit balls to reveal the Boo.

Gradual Infiltration Walkthrough

Gradual Infiltration Objectives

Gradual Infiltration How to Get 3 Stars

These numbers are values we got based on our runs. If you got 3-Stars with better scores, take pride in it and share a picture in our Missions Record Boards!

Capture All the Ghosts as Soon as Possible!

The ghost that appear during this bonus mission may appear at different locations across multiple attempts. Check your map to see which areas are infested with ghosts.

Rush towards the first room in your list. Use your Strobulb to stun ghosts, and reel them in with a fully charged Poltergust A-Pull. Next two rooms will given after clearing the first room.

Strategically choose the room closer to your current room to save time. After clearing both rooms, you will receive the third list of infested rooms. This time it will be 3 infested rooms. After clearing the last set of rooms, the bonus mission will end.

100% Checklist

Gradual Infiltration Possible Enemies

Enemies Encountered in Gradual Infiltration

Greenie	Slammer	Hider
Poltergeist

Luigi's Mansion 2: Dark Moon Related Guides

All Mansions and Stages

All Mission Guides

Post-Game

ScareScraper Records Board