Find the grave room.
Take the hub elevator to Floor 3. Explore the maze until you find the room with gravestones and the locked coffin. Keep track of the route back.
Watch from 0:42THE HOLLOW / THIRD NIGHT
The Hollow
floor 3 puzzle.
Eight graves hold your answer. Work out the three shortest lives, open the coffin, and bring the relic home.
01—08
Your dates. Your sequence.
The answer changes between runs.
03
THE OBJECTIVE
Solve the grave lock.
Return the third relic.
GRAVE LOCK / DEMONOLOGYINDEPENDENT GUIDE · SOURCE REVIEW 25 OCT 2026
01
Read all eight
gravestones.
02
Death year − birth year
gives the lifespan.
03
Enter the three shortest.
Youngest first.
01 / THE GRAVE LOG
A LITTLE MATH. A WAY OUT.Let the dates
do the talking.
Copy the birth and death years from your own stones. We’ll sort the ages and give you the three symbols in order.
02 / INTO THE THIRD NIGHT
THE ROUTE, WITHOUT THE GUESSWORK.From the elevator.
Back to the elevator.
The room’s position can change. Follow the clues in your run, then return with the relic to finish the floor.
Read. Subtract. Sort.
Read every stone and its symbol. Calculate death year minus birth year, then arrange the lifespans from smallest to largest.
1876 − 182650 years
Use the grave log Open it. Bring it home.
Set the lock to the three youngest symbols, youngest first. Press Open, take the third relic, and make it back to the elevator.
See the relic returnSteps follow KAM Gats’ recorded run, 0:42–3:26. This is a video-based guide; we do not claim an in-game playtest. View the evidence.
03 / SEE THE SOLVE
REAL RUNS. DIFFERENT ANSWERS.A little light
in the dark.
Watch the grave puzzle in an actual run.
Use the chapter buttons to get to the bit you need.
By KAM Gats . A different run means a different sequence.
THE FLOOR 3 REWARD
Official Roblox catalog render
Official Roblox catalog render04 / BRING SOMETHING BACK
Meet
Festering Felix.
The grave lock is part of the third relic task. Collect the relic and return to the hub; opening the coffin alone doesn’t complete the recorded run.
The official catalog lists Festering Felix as a head accessory. Check the in-game notification and your Roblox inventory after returning.
View the official itemIs there one code for everyone?
No. The creator’s follow-up warns that each player’s puzzle can differ. Use the dates and symbols in your own run. The calculator’s example is practice data.
Which direction do I subtract?
Death year minus birth year. For 1826–1876, the lifespan is 50 years. Sort by this difference, not by who was born first.
What if my ages are the same?
Recheck the years and matching symbols. We have not verified a tie-breaking rule, so the calculator won’t invent an answer when a tie affects the code.
Why didn’t the reward appear?
Check that you picked up the relic and returned to the elevator. The recorded run shows the badge after returning. Check your inventory separately; we cannot guarantee a fix for delayed item delivery.
Is this Demonology’s separate event quest?
This guide covers the hub’s Floor 3 grave lock. The same creator’s video has a separate Demonology quest beginning at 6:37. Follow the Floor 3 chapter for the third relic.