The Hollow Floor 3 Puzzle
Fan WikiFloor 3 of Roblox's The Hollow event hides the Demonology puzzle: a coffin with a Grave Lock, eight gravestones, and a code built from the youngest ghosts at death. Solve it, dodge the Biter on the way back, and the Third Night Relic earns you the Festering Felix UGC item and its badge. This hub carries the full step-by-step solution, the age math explained, and every floor's puzzle alongside it.
Latest Updates
Avoiding the Biter: Maze Survival on The Hollow Floor 3
How to Reach Floor 3 in The Hollow: Elevator, Hub and Access
The Grave Lock Code Method: How the Floor 3 Password Is Built
The Hollow Floor 3 Puzzle Solution: The Demonology Grave Lock Code
Festering Felix and the Third Night Relic: The Floor 3 Reward Chain
The Hollow Floors 1 and 2: The Other Hub Puzzles
Start Here
Start Here
The Solution
The Grave Lock code, step by step.
The Age Math
Birth dates, death dates, three youngest.
The Reward
Third Night Relic to Festering Felix.
Stay Current
Updated through the event.
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Avoiding the Biter: Maze Survival on The Hollow Floor 3
How to survive the Demonology maze in The Hollow Floor 3 — the Biter's patrol behavior, wall-hugging movement, and the two dangerous legs of the floor.
How to Reach Floor 3 in The Hollow: Elevator, Hub and Access
Getting to Floor 3 in The Hollow — the hub elevator, the floor's unlock order, the randomized maze on arrival, and what to know before descending to the Demonology floor.
The Grave Lock Code Method: How the Floor 3 Password Is Built
How the Demonology Grave Lock code works in The Hollow Floor 3 — why the three-youngest-at-death rule is constant while every gravestone value is randomized, and how to do the math fast.
The Hollow Floor 3 Puzzle Solution: The Demonology Grave Lock Code
The complete The Hollow Floor 3 puzzle solution — find the Demonology room, read all 8 gravestones, build the Grave Lock code from the three youngest at death, and take the Third Night Relic.
Festering Felix and the Third Night Relic: The Floor 3 Reward Chain
The complete The Hollow Floor 3 reward chain — the Third Night Relic from the coffin, the escape run, and how it converts into the Festering Felix UGC head accessory and badge.
The Hollow Floors 1 and 2: The Other Hub Puzzles
The Hollow hub's other floors alongside Floor 3 — Floor 1's puzzle pieces and Floor 2's Witches Brew Nado, how the floor structure works, and where the Demonology floor fits.
Avoiding the Biter: Maze Survival on The Hollow Floor 3
How to survive the Demonology maze in The Hollow Floor 3 — the Biter's patrol behavior, wall-hugging movement, and the two dangerous legs of the floor.
How to Reach Floor 3 in The Hollow: Elevator, Hub and Access
Getting to Floor 3 in The Hollow — the hub elevator, the floor's unlock order, the randomized maze on arrival, and what to know before descending to the Demonology floor.
The Grave Lock Code Method: How the Floor 3 Password Is Built
How the Demonology Grave Lock code works in The Hollow Floor 3 — why the three-youngest-at-death rule is constant while every gravestone value is randomized, and how to do the math fast.
The Hollow Floor 3 Puzzle Solution: The Demonology Grave Lock Code
The complete The Hollow Floor 3 puzzle solution — find the Demonology room, read all 8 gravestones, build the Grave Lock code from the three youngest at death, and take the Third Night Relic.
Festering Felix and the Third Night Relic: The Floor 3 Reward Chain
The complete The Hollow Floor 3 reward chain — the Third Night Relic from the coffin, the escape run, and how it converts into the Festering Felix UGC head accessory and badge.
The Hollow Floors 1 and 2: The Other Hub Puzzles
The Hollow hub's other floors alongside Floor 3 — Floor 1's puzzle pieces and Floor 2's Witches Brew Nado, how the floor structure works, and where the Demonology floor fits.
What Is The Hollow Floor 3 Puzzle?
The Hollow is Roblox's platform-wide Halloween event, and its central hub descends through a haunted movie theater floor by floor. Floor 3 is the Demonology floor: somewhere in its randomized maze spawns a puzzle room with a coffin, a Grave Lock, and eight gravestones — each marked with a picture (Broom, Ghost, Witch's Hat, Bat, Spider, Cauldron, Pumpkin, Scared Cat), a name, a birth date and a death date.
The password is built from the three youngest ghosts at death: subtract each birth date from its death date, and the three gravestones with the smallest ages hold the code. Open the coffin, grab the Third Night Relic, escape past the Biter, and the Festering Felix UGC item is yours.
Explore All GuidesCoverage
4 Sections
Solution
Verified
Type
Fan Wiki
Explore the Wiki
Every Floor 3 section at a glance.
Floor 3 Puzzle Guides
Everything in the guide section.
Floor 3 Puzzle Solution
Everything in the solution section.
Floor 3 Puzzle Rewards
Everything in the rewards section.
Floor 3 Puzzle Floors
Everything in the floors section.
Frequently Asked Questions
Quick answers about the Floor 3 puzzle.
Open the Grave Lock
Start with the step-by-step solution.