Capturing Boos are introduced as early as Gloomy Manor's "Visual Tricks" mission. However, the game does not explicitly tell you what is the reward for capturing them all.
Unlockable How to Unlock Gradual Infiltration Capture all 5 Boos in "Gloomy Manor" Hostile Intrusion Capture all 5 Boos in "Haunted Towers" Outlandish Interruption Capture all 5 Boos in "Old Clockworks" Severe Infestation Capture all 3 Boos in "Secret Mine" Terrifying Invasion Capture all 5 Boos in "Treacherous Mansion"
E. Gadd Medals
You can obtain golden medals with E. Gadd's face on them that appear on your save file if specific requirements are met. There are three to collect.
Unlockable How to Unlock #1 Complete the Dark Moon Quest mode. #2 Obtain a 3 star rank on every mission in the Dark Moon Quest mode. #3 Complete E. Gadd's Vault Room (All Gems, Boos, and Ghosts)
Endless Floors in the Scarescraper
This option creates a Scarescraper with infinite floors as well as its own difficulty, also named "Endless".
Unlockable How to Unlock Hunter Endless Beat a Hunter mode in a 25F Scarescraper, then "Create a Scarescraper". Polterpup Endless Beat a Polterpup mode in a 25F Scarescraper, then "Create a Scarescraper". Rush Endless Beat a Rush mode in a 25F Scarescraper, then "Create a Scarescraper". Surprise Endless Beat a Surprise mode in a 25F Scarescraper, then "Create a Scarescraper".
Contributed By: Darkunov.
Gold File Frame
Unlockable How to Unlock Gold File Frame Obtain all 3 E. Gadd Medals
Contributed By: Michael-Ike-9.
Poltergust 5000 Upgrades
As you find and obtain gold in this game, you will periodically unlock upgrades to the Poltergust 5000, your primary weapon against the ghosts infesting Evershade Valley. These unlockables can result in the ability to deal stronger attacks to ghosts or to allow your Dark-Light Device to have more use.
Unlockable How to Unlock #1 - Power Gauge Upgrade Collect 2,000 Gold #2 - Dark-Light Upgrade Collect 4,000 Gold #3 - Power Gauge Upgrade Collect 7,000 Gold #4 - Dark-Light Upgrade Collect 10,000 Gold #5 - Super Poltergust Collect 20,000 Gold
Contributed By: KeyBlade999.
Beat the mission "Visual Tricks" in Gloomy Manor.
Contributed By: HeyIhaveA3ds.
Collecting all thirteen of a mansion's gems will unlock a statue that can be seen in the vault's gem collections.
Unlockable How to Unlock Luigi Statue Collect all gems Gloomy Manor Luigi Statue Collect all gems in Haunted Towers Luigi Statue Collect all gems in Old Clockworks Luigi Statue Collect all gems in Secret Mine Luigi Statue Collect all gems in Treacherous Mansion
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