• Skip to main content
  • Skip to header right navigation
  • Skip to site footer
Gameranx

Gameranx

Video Game News, Lists & Guides

  • News
  • Features
  • Platforms
    • Xbox Series X
    • PS5
    • Nintendo
  • Videos
  • Upcoming Games
  • Guides

Indiana Jones and the Great Circle: How to Complete the Secret Of Secrets Mystery

December 17, 2024 by Matt Villei

Unlock the safe and find the forgery.

Vatican City is the first major location that players will be able to explore in Indiana Jones and the Great Circle and while they try to learn about the whereabouts of the Cat Mummy, there are a lot of hidden things to uncover. One of these discoveries is the Mystery Quest called Secrets of Secrets. This optional mission takes players to the Sistine Chapel and challenges them to figure out a safe combination to get the rewards hidden inside. This guide will show players how to complete the Secret Of Secrets Mystery in Indiana Jones and the Great Circle.


How to Complete the Secret Of Secrets Mystery in Indiana Jones and the Great Circle

The Secret of Secrets Mystery can be found in the Sistine Chapel in the southern part of Vatican City. After getting the Clerical Disguise during the main story mission, you will be able to use the Clerical Key to open doors with stainless glass crosses on them. You will need this to enter the Sistine Chapel. Go to the Belvedere Courtyard at the center of the Vatican and go to the large double doors at the west end of the Courtyard. Go south down the path and then turn left to reach the exterior of the church.

There is a ladder that you can climb that leads up to some scaffolding. At the end of the scaffolding is a wall that you can climb with your whip. Use your whip to reach a small rooftop and then shimmy on the nearby pipes to enter the chapel via a window.

Head back down to the ground floor to find the Clerical door. Pass through the door and go to the west end of the chapel to find another door that leads to a small office. This is where you will be able to complete the Secret of Secrets Mystery. You can start it by picking up one of the Notes that are part of this Mystery. There are a total of 3 Notes related to the quest. Each of these Notes will give you hints on how to complete this Mystery. These Notes can be found in any order. You will know you found a Note tied to a Mystery since it will be labeled as a “Mystery Note.”

The first note is Nicoletti’s Letter, which can be found on a table next to the door you use to enter the room. The Note is from Father Nicoletti telling Father Luis that he has found an original copy of the Secretum Secretorum. This is a great find and would definitely belong in a museum so to get your hands on it, you will need to figure out the code of the safe that is in this room. The code can be figured out by entering a 4-digit code. The Note tells you the code can be solved by looking at a statue of Saint Peter and then Saint Paul.

The Peter statue is in the northeast corner of the room, while the Paul statue is next to the safe behind the desk in the center of the room. Both statues have astronomical symbols at the bottom, which will help you figure out the code for the safe.


Planetary Chart

Open the drawer on the left side of the desk to find the Planetary Chart Note showing the astronomical chart and the planets each symbol corresponds to. This tells you the number that each symbol represents.

On the bottom of the Peter statue are two Mars symbols. You can deduce this as Mars is the only planet on the chart that is smudged and the symbols on the bottom of Peter aren’t seen anywhere else on the chart. telling you that the first two numbers to the safe are both 4. On the bottom of the Paul statue is the Mercury and Uranus symbols but they are both upside down. This means you need to reverse the order of the numbers. This means the last two numbers are 7 and 1. This means the code to the safe is 4-4-7-1.

Inside the safe is the Secretum Secretorum, though it is obviously a fake. Underneath the Forged Book is the final Note for this Mystery, Hidden Note, which sees Nocoletti tell Luis of his plan to gain favor with the Germans with this discovery. Picking up this Note will complete the Secret of Secrets Mystery and will award you 100 Adventure Points. 

Also inside the safe is the Cutman I Adventure Book which you can collect and spend Adventure Points on to improve your stats. This book improves heath bar regeneration efficiency and can be unlocked for 250 AP.

You now know how to fully complete the Secret of Secrets Mystery in Indiana Jones and the Great Circle. Stay tuned to Gameranx for more news, updates, and guides for Indiana Jones and the Great Circle as well as other great games in the future.

Related Guides

Indiana Jones and the Great Circle: The Order of Giants – All Rome Field Note Locations
Indiana Jones and the Great Circle: The Order of Giants – All The Order of Giants Note Locations
Indiana Jones and the Great Circle: The Order of Giants – All Mitharic Artifact Locations
Indiana Jones and the Great Circle: The Order of Giants – Monster Gate Puzzle Guide
Indiana Jones and the Great Circle: The Order of Giants – How to Complete the A Bull in the Sky Mystery
Indiana Jones and the Great Circle: The Order of Giants – Tomb of Gibborim Puzzle Guide
Indiana Jones and the Great Circle: The Order of Giants – Gladiator Shrine Maze Puzzle Guide
Indiana Jones and the Great Circle: The Order of Giants – All Rome Adventure Book Locations
Indiana Jones and the Great Circle: The Order of Giants – How to Complete the A Tale of Wine Making Mystery
Indiana Jones and the Great Circle: The Order of Giants – Where to find the Via Giulia Cat | Pet the Cat Achievement Guide
Indiana Jones and the Great Circle: The Order of Giants – Water Serpent Puzzle Guide
Indiana Jones and the Great Circle: The Order of Giants – Mediterranean Map Mural Puzzle Guide
Indiana Jones and the Great Circle: The Order of Giants – How to Complete the “A Collegial Mystery” Mystery
Indiana Jones and the Great Circle: The Order of Giants – A Mystery Begins Fieldwork Walkthrough
Indiana Jones and the Great Circle: How to Start The Order of Giants DLC
Indiana Jones and the Great Circle: How to Get the Secret Ending
Indiana Jones and the Great Circle: All Iraq Collectibles | Ziggurat of Ur Notes, Books, and Relics Locations
Indiana Jones and the Great Circle: All Sukhothai Field Note Locations
Indiana Jones and the Great Circle: All The Blessed Pearl Note Locations
Indiana Jones and the Great Circle: All Sukhothai Medicine Bottle Locations
Indiana Jones and the Great Circle: All Sukhothai Adventure Book Locations
Indiana Jones and the Great Circle: All Sukhothai Ancient Relic Locations
Indiana Jones and the Great Circle: All Artifacts of Asia Locations
Indiana Jones and the Great Circle: The Big Board Game Puzzle Guide
Indiana Jones and the Great Circle: A Study in Fear Fieldwork Walkthrough
Indiana Jones and the Great Circle: All Khmer Cogwheel Locations and Puzzle Solutions
Indiana Jones and the Great Circle: The Nephilim Game Puzzle Guide
Indiana Jones and the Great Circle: Khmer Hidden Gate Puzzle Guide
Indiana Jones and the Great Circle: Lost in the Past Fieldwork Walkthrough
Indiana Jones and the Great Circle: The Kid Who Vanished Fieldwork Walkthrough
Indiana Jones and the Great Circle: Voss’ Gold Stash Fieldwork Walkthrough
Indiana Jones and the Great Circle: All Sukhothai Radio Frequency Locations
Indiana Jones and the Great Circle: How to Enter the Sukhothai Boxing Ring
Indiana Jones and the Great Circle: How to Get the Royal Army Disguise
Indiana Jones and the Great Circle: How to Complete the Monkey Business Mystery
Indiana Jones and the Great Circle: How to Complete The Counting Letters Mystery
Indiana Jones and the Great Circle: How to Complete The Serpent’s Chest Mystery
Indiana Jones and the Great Circle: How to Complete the Elephant In The Room Mystery
Indiana Jones and the Great Circle: How to Complete A Game of Wits Mystery
Indiana Jones and the Great Circle: How to Complete the Path Of The Tigers Mystery
Indiana Jones and the Great Circle: How to Complete The Timely Arrival Mystery
Indiana Jones and the Great Circle: How to Complete the Child’s Play Mystery
Indiana Jones and the Great Circle: All Into the Fire Note Locations | Shanghai Collectible Guide
Indiana Jones and the Great Circle: All Himalayas & Shanghai Adventure Book Locations
Indiana Jones and the Great Circle: All A Harsh Climb Note Locations | Himalayas Collectible Guide
Indiana Jones and the Great Circle: Kummetz Cipher Puzzle Guide
Indiana Jones and the Great Circle: All Gizeh Field Note Locations
Indiana Jones and the Great Circle: All The Idol of Ra Note Locations
Indiana Jones and the Great Circle: All Gizeh Medicine Bottle Locations
Indiana Jones and the Great Circle: All Gizeh Adventure Book Locations
Indiana Jones and the Great Circle: All Gizeh Ancient Relic Locations
Indiana Jones and the Great Circle: All Artifacts of Africa Locations
Indiana Jones and the Great Circle: The Three-Eyed Gate Puzzle Guide
Indiana Jones and the Great Circle: Chamber Of Resonance Puzzle Guide
Indiana Jones and the Great Circle: All Stele Locations
Indiana Jones and the Great Circle: All Gizeh Radio Frequency Locations
Indiana Jones and the Great Circle: A Savage Predicament Fieldwork Walkthrough
Indiana Jones and the Great Circle: Secrets of the Queen Mother Fieldwork Walkthrough
Indiana Jones and the Great Circle: Sanctuary of the Guardians Fieldwork Walkthrough
Indiana Jones and the Great Circle: How to Enter the Gizeh Boxing Ring
Indiana Jones and the Great Circle: How to Get the Wehrmacht Disguise
Indiana Jones and the Great Circle: How to Complete the Bright Future Mystery
Indiana Jones and the Great Circle: How to Complete the A Thief’s Promise Mystery
Indiana Jones and the Great Circle: How to Complete The Haunting Mystery
Indiana Jones and the Great Circle: How to Complete the Cloud Atlas Mystery
Indiana Jones and the Great Circle: How to Complete the Seat Of Eternity Mystery
Indiana Jones and the Great Circle: How to Complete the Fortune’s Reach Mystery
Indiana Jones and the Great Circle: All Vatican City Field Note Locations
Indiana Jones and the Great Circle: All The Stolen Cat Mummy Note Locations
Indiana Jones and the Great Circle: All Vatican City Medicine Bottle Locations
Indiana Jones and the Great Circle: All Vatican City Adventure Book Locations
Indiana Jones and the Great Circle: All Vatican City Ancient Relic Locations
Indiana Jones and the Great Circle: All Lost Artifacts of Europe Locations
Indiana Jones and the Great Circle: Gold Path Puzzle Guide
Indiana Jones and the Great Circle: Silver Path Puzzle Guide
Indiana Jones and the Great Circle: Fountain Of Confession Puzzle Guide
Indiana Jones and the Great Circle: Vatican Underworld Flame Puzzle Guide
Indiana Jones and the Great Circle: The Secret of Giants Fieldwork Walkthrough | All Strange Inscription Locations
Indiana Jones and the Great Circle: How to Enter the Underground Vatican City Boxing Ring
Indiana Jones and the Great Circle: How to Complete the Signs of Trouble Mystery
Indiana Jones and the Great Circle: How to Complete the Father And Son Mystery
Indiana Jones and the Great Circle: How to Complete the A Date to Remember Mystery
Indiana Jones and the Great Circle: A Nun In Trouble Fieldwork Walkthrough
Indiana Jones and the Great Circle: How to Complete the Free Spirit Mystery | All Cat Locations
Indiana Jones and the Great Circle: How to Complete the A Snake In The Garden Mystery
Indiana Jones and the Great Circle: How to Get the Blackshirt Disguise
Indiana Jones and the Great Circle: Sacred Wounds Puzzle Guide
Indiana Jones and the Great Circle: How to Complete the House Of God Mystery
Indiana Jones and the Great Circle: How To Fast Travel
Indiana Jones and the Great Circle: The Mad Priest Fieldwork Walkthrough
Indiana Jones and the Great Circle: A Savage Discovery Fieldwork Walkthrough
Indiana Jones and the Great Circle: How to Complete the Bulls Of Blood Mystery
Indiana Jones and the Great Circle: All Marshall College Note Locations
Indiana Jones and the Great Circle: The Exhibit Puzzle Guide
Indiana Jones and the Great Circle: All “The Golden Path” Prologue Collectibles Guide
Indiana Jones and the Great Circle: All Chest & Safe Codes

Share this post:

FacebookTwitterLinkedInPinterest

Recent Videos

Metroid Prime 4: Beyond - Before You Buy

Metroid Prime 4: Beyond - Before You Buy

ROUTINE - Before You Buy

ROUTINE - Before You Buy

10 Upcoming FPS Games That LOOK INSANE

10 Upcoming FPS Games That LOOK INSANE

Red Dead Redemption (PS5 Switch 2) - Before You Buy

Red Dead Redemption (PS5 Switch 2) - Before You Buy

This Game Wants To Be SKYRIM 2 Before Elder Scrolls 6

This Game Wants To Be SKYRIM 2 Before Elder Scrolls 6

Marvel Cosmic Invasion - Before You Buy

Marvel Cosmic Invasion - Before You Buy

Top 25 BEST PS5 Games of 2025

Top 25 BEST PS5 Games of 2025

10 WEIRD GAMING Stories of November 2025

10 WEIRD GAMING Stories of November 2025

DESTINY 3 LEAKED, CONSOLE PRICES GOING UP AGAIN? & MORE

DESTINY 3 LEAKED, CONSOLE PRICES GOING UP AGAIN? & MORE

Category: FeaturesTag: Guides, Indiana Jones And The Great Circle, indiana jones and the great circle guides gameranx, PC, Xbox Series X/S

Sidebar

Recent Posts

  • GTA 6 Fans Discuss The Places In-Game They Want To Explore The Most
  • Epic Games Store Has A Special Mystery Giveaway For You During The Game Awards
  • How Many Gamers Have Truly 100% Completed Borderlands 4?
  • Todd Howard Invited the Obsidian Team To See Fallout Season 2 New Vegas Set
  • GTA 6 Fans Once Again Attempt To Predict “Timeframe” For What Comes Next

Copyright © 2025 · Gameranx · All Rights Reserved · Powered by Mai Theme