The Grave Lock Code Method: How the Floor 3 Password Is Built

The Grave Lock is The Hollow Floor 3's puzzle heart, and it works on a rule that never changes — even though every input does. Understanding the method means you can solve any randomized instance in five minutes. This page is the method, explained.

What Randomizes and What Does Not

Every restart of The Hollow rerandomizes Floor 3: the maze layout, the puzzle room's spawn location, and every gravestone's name, picture set, birth dates and death dates. What never changes is the rule: the Grave Lock opens with the pictures of the three gravestones whose owners died youngest, ordered youngest first. This split — randomized inputs, constant rule — is why "the code" as a search term always needs the method, not a number.

The Math, Mechanically

For each of the eight gravestones: death year minus birth year = age at death. The dates are full dates, but the subtraction only needs the years — if a stone reads 1874–1921, that person's age is 47. Two edge cases worth knowing: dates that cross a century boundary still subtract cleanly (1899–1931 is 32), and if a stone's death date falls on the person's birthday window the exact-day age can differ by one — the puzzle's granularity is the year, so use years.

Eight subtractions later you have eight ages. Sort them. The bottom three are your answer, in ascending order — youngest first, then second-youngest, then third. Their pictures are the password sequence.

A Fast Workflow for the Room

Bring order to the chaos: walk the room clockwise, reading each gravestone once, and jot picture + age as you go (the pictures are consistent icons — Broom, Ghost, Witch's Hat, Bat, Spider, Cauldron, Pumpkin, Scared Cat — so shorthand works). By the time you complete the circle, your three youngest are already visible. Then walk the lock and punch the pictures. Total room time on a clean run: about three to five minutes — budget more with Biter interruptions.

Why "Youngest" Makes the Puzzle Good

The design is a nice inversion: grave math usually asks "how old" as trivia; here the lowest numbers win, which forces you to actually compute all eight instead of pattern-matching the biggest spooky dates. It also makes the hint poem matter — the room teaches its own rule before you need it. Once you see the structure, the Grave Lock stops being a mystery and becomes a checklist, which is exactly what this page is for.

When Your Code Fails

Three causes cover failed attempts: order mistakes (the lock wants youngest→oldest among your three, not arbitrary), an arithmetic slip (recheck the two closest ages — ties and near-ties are where errors live), and a restart (if you died and rejoined, values may have rerandomized — re-read the stones, do not reuse your notes). The full solution walkthrough covers the whole room flow from maze entry to escape.