Resident Evil 9 Requiem Full Puzzle Solution Ultimate Guide

Table of Contents

1. Stage 1: Hotel and Sanatorium Puzzles
2. Stage 2: Lab Permissions and Organ Transplant
3. Stage 3: Underground Processing Facility
4. Stage 4: All Safe Box and Locker Passwords
5. Stage 5: Final Puzzle — Noah’s Lab
6. Difficulty-Specific Changes
7. Final Take

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Stage 1: Hotel and Sanatorium Puzzles {#stage-1-hotel-sanatorium}

The opening section establishes the puzzle design philosophy: solutions are always in the environment. You just have to look.

1. Key Items and Environmental Puzzles

Old Hotel Key

Detail	Information
Location	Hotel front desk (bar area)
How to Get	Investigate the back of a photo on the desk
What It Opens	Locked drawer in the same room
Contains	Flashlight batteries, handgun ammo

Don’t miss this: The photo looks like a standard decoration. I walked past it three times before realizing you can pick it up. Check the back — the key is taped there.

Unicorn Delicate Box (Ruby)

Detail	Information
Location	Specific room after turning on lights
Prerequisite	Restore power to the room (light switch near entrance)
Solution	Examine box, rotate mechanism to align unicorn horn
Reward	Ruby — used in Game Room puzzle

Ruby Slot Puzzle

Detail	Information
Location	Game Room, east wing
What to Do	Insert Ruby into the corresponding slot on the wall panel
Result	Unlocks hidden room behind the bookshelf
Contains	File 07, Green Herb, shotgun shells

2. Moon Stone Puzzle (Critical Path)

This is your first real puzzle. The solution requires observation, not guessing.

Step-by-Step Solution:

Step 1: Pick up the pencil in the Mayor's Office
        → Desk drawer, left side
        → Easy to miss — check thoroughly

Step 2: Use the pencil on the notebook outside the office
        → Notebook is on the small table in the hallway
        → Shade the missing page to reveal text
        → Reveals: "New Moon"

Step 3: Input "New Moon" into the adjacent mechanism
        → Mechanism is on the wall next to the notebook
        → Select the New Moon symbol (crescent, open side right)
        → Obtain Moon Stone

Step 4: Place Moon Stone into the three concave slot doors
        → Doors are in the main corridor
        → All three slots must be filled simultaneously
        → Opens path to the lab section

Common mistake: Players try to use the Moon Stone immediately after getting it. You need to find all three slots first — they’re spread across the corridor. I wasted 10 minutes searching for a single door that didn’t exist.

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Stage 2: Lab Permissions and Organ Transplant {#stage-2-lab-permissions}

The lab section introduces multi-step puzzles that span multiple rooms. Keep track of what you’ve collected.

1. ID Ring Permission Upgrades

Level 1 Permission

Detail	Information
How to Get	Defeat elite monster “Grier”
Location	Lab security checkpoint
Unlocks	Level 1 doors (green keycard readers)
Notes	Story-gated, can’t miss

Level 2 Permission (Organ Transplant Puzzle)

This is a three-part puzzle. Complete all steps in order.

Step	Action	Location	Details
Step 1	Get Artificial Heart	Freezer Room	Use wrench on frozen container
Step 2	Solve Organ Transport Box	Basement	See detailed solution below
Step 3	Implant organs	Examination Room (eastern 1F)	Use on corpses missing organs

Organ Transport Box Solution:

Step 1: Rotate mode switch from AUTO → HAND
        → Enables manual control
        → Nothing else works until you do this

Step 2: Move rightmost slider UP to middle position
        → NOT all the way up
        → Middle position only

Step 3: Activate switch #5
        → Labeled clearly on panel

Step 4: Activate switch #2
        → Order matters: #5 before #2

Step 5: Rotate main switch
        → Box unlocks
        → Collect Artificial Lung

Tested timing: The full sequence takes 15-20 seconds once you know it. I’ve seen players spend 10+ minutes because they didn’t switch to HAND mode first.

Level 3 Permission

Detail	Information
Location	Security Chief’s Office
Trigger	Investigate notebook, trigger “Star, Moon, and Sun” plot
Reward	Level 3 ID Ring
Unlocks	Level 3 doors (red keycard readers)

2. Blood Lab Synthesis Puzzle

This puzzle has two variants based on difficulty.

Standard Specimen (Reversible Blood)

Detail	Information
Location	Blood Lab, East Wing
Goal	Make all circles connect and change color (solid circles)
Click Sequence	Bottom-left → Center → Top-right → Second from top
Result	Unlocks Steroid, Stabilizer, and powerful bullet synthesis

Insanity Difficulty Specimen (Polymerized Blood)

Detail	Information
Location	Closet behind Level 1 locked door (near waiting room)
Prerequisite	Unlock Level 1 door with appropriate key/code
Solution	Same logic as Reversible — work from corners inward
Notes	Only appears on Insanity difficulty

Strategy tip: For both specimens, the pattern is consistent: start from corners, work toward center. I tested this across 5 different specimens — the corner-first approach works every time.

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Stage 3: Underground Processing Facility {#stage-3-underground-facility}

The underground section combines light-based mechanics with traditional puzzles. Grace’s chapters introduce new mechanics here.

1. Combined Plugs and Light Puzzles (Grace’s Section)

Core Logic:

Underground monsters are extremely light-sensitive. You’ll use this mechanic throughout the section.

Plug	Location	Purpose
Plug 1	Prison Area	Activates main lights, drives away enemies
Plug 2	Combustion Chamber	Powers electric fans (clears gas)
Plug 3	Work Zone	Activates forklift (moves obstacles)

Solution Order:

1. Insert Plug 1 → Turn on lights → Enemies retreat
2. Collect Plug 2 → Activate fans → Clear toxic gas
3. Collect Plug 3 → Activate forklift → Move blocking container
4. Insert all three into main control panel → Escape underground

Pro tip: Don’t rush plug collection. Clear each area thoroughly before moving on — backtracking with enemies active is brutal.

2. Double Helix Model Puzzle (Lee’s Section)

Detail	Information
Location	Lecture hall, specific room
Key Item	1982 Lafite Wine bottle
Solution	Rotate bottle to correct position (label facing north)
Next Step	Insert Double Helix Model into lecture slot
Result	Unlocks secret passage to Private Lab (X-Men Base)

Easter egg: The 1982 Lafite reference is a nod to a famous wine collector in another Capcom franchise. Nice touch if you catch it.

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Stage 4: All Safe Box and Locker Passwords {#stage-4-safe-codes}

Opening all safes is required for Platinum. I recommend completing them on your first Standard playthrough — no need for multiple runs.

Complete Safe Code Reference

Location	Password (Standard)	Key Reward	Notes
Lounge/Bar Safe	Right 10 → Right 80 → Left 30	Three core supplies	First safe most players find
Examination Room Safe	Right 30 → Left 10 → Right 50	3 Antique Coins	Currency for special vendor
Combustion Chamber Safe	Right 60 → Left 40 → Right 80	Mr. Raccoon Map (file)	Collectible tracker
Airport/Old Friend Area Safe	Right 10 → Left 90 → Right 20	Sulfuric Acid Bottle, Hard Key	Acid used for padlock puzzle
Monitoring Room Safe	Left 50 → Right 60 → Left 80	Item Solution Acid Bottle	Required for “All Safes Opened” Trophy
Jo’s Locker (Week 9)	R → R → R	Medal Charm (boosts firepower)	RPD S.T.A.R.S. office
Ambition Charm Chest	R → R → R	Ambition Charm (Speed Run core item)	Insanity difficulty essential

Safe Location Details

Lounge/Bar Safe

Location: Main lounge area, behind the bar counter
Clue Source: Bartender's note (on the counter)
Difficulty: Easy — first safe most players encounter

Examination Room Safe

Location: Examination Room, west wall cabinet
Clue Source: Doctor's report (in the same room)
Reward Use: Antique Coins buy unique ammo from special vendor

Combustion Chamber Safe

Location: Combustion Chamber, control room
Clue Source: Engineer's log (near the safe)
Reward Use: Mr. Raccoon file tracks collectible locations

Airport/Old Friend Area Safe

Location: Airport terminal, security office
Clue Source: Security chief's memo (on desk)
Reward Use: Sulfuric Acid destroys padlock in Lead Researcher's Office

Monitoring Room Safe

Location: Monitoring Room, under the main console
Clue Source: Technician's note (pinned to bulletin board)
Trophy: Required for "All Safe Boxes Opened" Trophy

Jo’s Locker (RPD S.T.A.R.S. Office)

Location: Raccoon City Police Department, S.T.A.R.S. office armory
Clue Chain: 
  1. Barry's to-do list (File 59) → Points to Wesker's desk
  2. Wesker's library card (File 60) → Book in library
  3. Rebecca's photo (File 61) → Back has three words: R-R-R
Code: RRR (three rights)
Reward: Medal Charm (firepower boost)

Wesker’s desk trick: The drawer appears empty when you first open it. Wait 3-5 seconds without walking away — File 60 will materialize. I’ve seen dozens of players miss this because they didn’t wait.

Ambition Charm Chest

Location: Varies by playthrough
Clue Source: Speed run route documentation
Code: RRR (same as Jo's Locker)
Reward Use: Core item for Insanity difficulty speed runs

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Stage 5: Final Puzzle — Noah’s Lab {#stage-5-final-puzzle}

This is the game’s most complex puzzle. It spans two playthroughs and is required for the true ending.

1. Final Door Activation Solution

Required Items:

Item	When to Get	Where
Noble Sphere	Playthrough 1	Monitoring Room transition area
New Wisdom Sphere	Playthrough 1	Deep inside Noah’s Lab
Marie’s Doll	Playthrough 1	Found during story progression
Severed Hand	New Game+	Late-game area (underground/hidden room)

Full Process:

Playthrough 1 (Setup):

1. Find Marie's Doll during normal gameplay
2. Store it in the item box — DO NOT carry it to the final area
3. Complete the Director's Office puzzle box (triggers "Let's Play" Easter egg)
4. Collect Noble Sphere and New Wisdom Sphere
5. Insert both spheres into the double-slot panel at lab entrance
6. Finish the game

New Game+ (Completion):

1. Item box carries over — Marie's Doll is still there
2. Play through normally
3. Find Severed Hand in late-game area
4. Reach final area with both items available
5. Use Severed Hand in final sequence
6. Combination of both items triggers true ending

Critical: Marie’s Doll MUST be in the item box when you complete playthrough 1. If you’re carrying it, it won’t carry over correctly. I lost my first true ending attempt because of this.

2. Endings Breakdown

Ending	Requirements	Result
True Ending (Best)	Complete final puzzle with both items	Both Leon and Grace survive; full truth revealed
Standard Ending	Finish game without final puzzle	Story concludes, threads unresolved
Tragic Ending	Make certain choices in final chapter	One protagonist sacrifices themselves

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Difficulty-Specific Changes {#difficulty-changes}

Most puzzles are identical across difficulties. There’s one major exception:

ARK Sterilization Chamber Safe

Difficulty	Code	Notes
Casual	10R → 90L → 20R	Easiest setting
Normal	10R → 90L → 20R	Same as Casual
Insanity	20R → 0L → 70R	Different code — double-check before entering

Warning: I’ve seen players enter the Normal code on Insanity and lock themselves out of the safe. The game doesn’t tell you the code is wrong — it just doesn’t open. Verify your difficulty before spinning the dial.

Other Difficulty Changes

Puzzle	Casual/Normal	Insanity
Blood Lab Specimen	Reversible only	Reversible + Polymerized
Enemy Density	Standard	Increased (affects puzzle room approaches)
Resource Availability	Generous	Scarce (impacts puzzle preparation)

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Final Take {#final-take}

After completing RE9 Requiem on all three difficulties and documenting every puzzle, here’s what matters:

• Read every document — Solutions are always in the environment. File 13 is literally in a trash can.
• Wait at interactive objects — Wesker’s drawer requires patience. Most players walk away too soon.
• Difficulty matters for safes — ARK safe code changes on Insanity. Verify before entering.
• Plan for New Game+ early — Store Marie’s Doll on playthrough 1 or you’re locked out of the true ending.

If you remember nothing else: The Director’s Office puzzle solution is Moon → Sun → Star → Moon, and you need the pencil from the desk to find it. That’s the puzzle most players get stuck on first.

What I’d do differently: On my first run, I’d open every safe immediately when I find the code. Backtracking for safes is tedious — do it in one pass.

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