Embarking on a thrilling adventure in the vast expanse of Luigi’s Mansion 3, you’ll encounter a myriad of challenges, puzzles, and hidden treasures. Among these, the elusive 3F gems hold a special allure, offering unique upgrades and enhancing your gameplay experience. This comprehensive walkthrough will guide you through the process of finding all the 3F gems, ensuring you don’t miss out on any of these sparkling prizes.
Before we dive into the gem-hunting expedition, let’s briefly understand what makes these 3F gems so valuable. Short for ‘Floor 3,’ these gems are scattered across the third floor of the Last Resort hotel. Collecting all six of them will unlock the powerful Poltergust G-00 upgrade, significantly boosting your sucking power and making your ghost-catching adventures even more exhilarating.

Exploring the Third Floor: Initial Gems
The third floor is a sprawling area filled with diverse rooms and hidden nooks. Your first gem awaits in the ‘Grand Hall’ room, just after you’ve obtained the Elevator Key. Look for a small, glowing gem tucked away in a corner, near the grand piano.
Your next gem can be found in the ‘Art Gallery’ room. To reach it, you’ll need to use the Poltergust to move a heavy statue blocking your path. Once you’ve cleared the way, the gem will be revealed, shining brightly amidst the artwork.
Unlocking the ‘Dark Light’ Ability
Before you can access the remaining gems, you’ll need to unlock the ‘Dark Light’ ability. This powerful tool allows Luigi to reveal hidden objects and secrets, making it an invaluable asset in your gem-hunting quest. Head to the ‘Boiler Room’ and interact with the boiler to trigger a cutscene, leading you to the ‘Dark Light’ upgrade.
With the ‘Dark Light’ in your possession, it’s time to return to the third floor and uncover the remaining hidden gems.

Finding the Hidden Gems with Dark Light
Armed with your newfound ability, you can now scan the third floor for hidden gems. Start by returning to the ‘Grand Hall’ room. Use the ‘Dark Light’ to reveal a hidden gem located behind a painting near the staircase.
Next, make your way to the ‘Library’ room. Here, you’ll find a gem hidden behind a bookshelf. Use the ‘Dark Light’ to scan the room and locate the correct bookshelf to interact with, revealing the gem.
Venturing into the ‘Forgotten Depths’
With four gems already in your possession, it’s time to explore the ‘Forgotten Depths,’ a secret area hidden beneath the third floor. To access this mysterious location, you’ll need to find a hidden entrance in the ‘Attic’ room. Use the ‘Dark Light’ to scan the floor and locate a weak spot, leading you to a ladder descending into the ‘Forgotten Depths.’

Once you’ve entered the ‘Forgotten Depths,’ you’ll encounter a series of challenging puzzles and ghostly inhabitants. Navigate through this eerie realm, using your wits and the ‘Dark Light’ to uncover the final two gems.
Solving the Puzzle Room
In the ‘Puzzle Room,’ you’ll find the fifth gem resting on a pedestal. To reach it, you’ll need to solve a series of puzzles involving moving platforms and pressure plates. Use the ‘Dark Light’ to reveal the correct path and guide Luigi safely to the gem.
With the fifth gem secured, it’s time to face the final challenge: the ‘Boss Battle’ against a menacing ghost. Defeat this spectral foe to claim the sixth and final 3F gem, completing your collection and unlocking the powerful Poltergust G-00 upgrade.
Congratulations! You’ve successfully hunted down all six 3F gems, unlocking a powerful upgrade and enhancing your Luigi’s Mansion 3 experience. As you continue your adventure through the Last Resort hotel, remember to stay vigilant and explore every nook and cranny – you never know what hidden treasures await!






















