Cracking the Father and Son safe code in Indiana Jones and the Great Circle is one of the first really tricky puzzles that you encounter in the game, and that's saying a lot when you find a new mystery to unravel every five minutes or so. This one appears in the Vatican after you save Giuliana during A Nun in Trouble and it'll require all of your critical faculties to solve.

Okay, that's a bit of an exaggeration, but it is fairly complex. You'll need to recognise a pattern on one sheet of paper and use it to decipher the safe code on another. To make matters worse, one of the pieces of information is literally wrong, so there's no way to reach the correct answer using the right method—don't ask me why. Either way, here's the Father and Son safe code in Indiana Jones and how you were supposed to get it.

After you help Gina save Giuliana in A Nun in Trouble, she'll give you a key to a secret room in the Borgia Tower—the same place you just rescued her. You likely encountered this door earlier when you used the whip to swing across a gap to get behind a door blocked from behind. If not, head back down the tower until you spot the gap you can use your whip to swing over, with a door directly on the other side.