How to find the ‘Secret of Secrets’ safe code in Indiana Jones and the Great Circle

“Secret of Secrets” is a mystery you’ll find as you explore Indiana Jones and the Great Circle’s Vatican. You’ll be able to find it once you reach the Sistine Chapel. The safe — and all the clues — are located in a small office off the west end of the chapel.

Our Indiana Jones and the Great Circle guide will show you how to find the “Secret of Secrets” safe code.

How to start the ‘Secret of Secrets’ mystery

Once you reach the Sistine Chapel, you’ll be able to access the “Secret of Secrets” safe. Head to the west end of the chapel and look for the door to the left of the altar. Head into that office.

‘Secret of Secrets’ clues

As soon as you walk in, look to the right to find Nicoletti’s Note. That’ll start the mystery.

The safe you’re going to open is to the left, but there are other clues to find first.

Head to the desk and open the drawer to find a Planetary Chart. This is where you’ll get the numbers for the safe combination.

The remaining clues are the statues of Saints Peter and Paul. Peter is in the corner to the left of the desk. Paul is right next to the safe.

The statues themselves aren’t the clues. You’ll need to use the right thumbstick to rotate the statue until you can see the bottom.

‘Secret of Secrets’ safe code solution

Nicoletti’s Note tells you the order to look at the statues — Peter first, and then Paul — to get the planetary symbols. They’ll be upside down, but they are ♂︎, ♂, ⛢, and ☿ — or Mars, Mars, Uranus, and Mercury.

If you look at the Planetary Chart note, you’ll see the planets are numbered from bottom to top. The symbol for Mars is missing, but it’s in the fourth orbit (where you’d expect).

That makes the safe combination — 4471. Inside, you’ll find a Cutman 1 adventure book, a Hidden Note, and a forged book. You can take the book with you, but there’s nothing to do with it.

For more Indiana Jones and the Great Circle guides, here’s a running list of safe codes. We also have solutions for many puzzles in the Vatican, including the Belvedere Courtyard, the Fountain of Confession, “Father and Son,” “A Date to Remember,” “Bulls of Blood,” “House of God,” and “A Free Spirit,” plus guides to Strange Inscription and Vatican Ancient Relic locations.